How to Clean Sky-Frame Windows: Professional Care for Frameless Glass
Sky-Frame windows are unlike anything else on the market. Floor-to-ceiling frameless sliding glass panels — some up to 4 metres high — that blur the boundary between indoor and outdoor space. Swiss-engineered, minimalist, and genuinely beautiful.
They're also a unique cleaning challenge. And I say that as someone who's been cleaning premium glass for 25 years.
As an Orloff's Window Cleaning Training partner with Sky-Frame, I've worked with these systems extensively. The frameless design, the large-format panels, the concealed tracks, the specialised coatings — all require a specific approach that goes beyond standard window cleaning.
Here's the professional guide to keeping your Sky-Frame glass crystal clear without damaging the engineering that makes it extraordinary.
Why Sky-Frame Requires Special Attention
Standard windows have frames that define the edges of the glass. When you squeegee a standard window, the frame catches any water that runs to the edge. The boundaries are clear.
Sky-Frame is different. The frameless design means glass meets floor, glass meets ceiling, glass meets glass. The panels slide on concealed sill tracks with integrated drainage systems. The glass itself often features thermal and solar protection coatings that must be treated with care.
Three specific challenges make Sky-Frame cleaning different from standard window cleaning:
The scale. Sky-Frame panels can be enormous — up to 4 metres high and individual panels of 90 square feet. Cleaning a single panel requires confident, continuous squeegee strokes across a large surface area. Hesitation or inconsistency across these dimensions creates visible streaks that are magnified by the sheer size of the glass.
The coatings. Many Sky-Frame installations include low-E coatings, solar protection layers, or other specialised glass treatments. These coatings are essential for thermal and acoustic performance, but they can be damaged by abrasive cleaners, harsh chemicals, or aggressive scrubbing.
The track system. Sky-Frame's innovative sill track and drainage systems are engineered to be virtually invisible. But they still need maintenance — debris, dust, and water residue can accumulate in the track, affecting the smooth operation of the sliding panels.
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What Sky-Frame Recommends
Sky-Frame's user manual (Section 6: Cleaning and Care) lays out a clear 7-step process:
- Clean panes of glass with a soft cloth and a normal commercial glass cleaner.
- Remove soiling from base profile with a vacuum cleaner.
- Clean base profile with a damp cloth and a liquid cleaning agent.
- Check the gutter for soiling and clean if necessary.
- Ensure that the water can flow away in the gutter.
- Remove all tools, materials and other equipment from the working area.
- Clean working area and remove any materials such as liquids, consumables or the like.
Sky-Frame is also very specific about what NOT to do: never use metal blades or glass scrapers (these can cause severe damage to TSG-HST glass), no abrasive or scouring material, never use cleaning agents containing solvent, do not use alkalis (lyes), and high pressure washing is not recommended. They also warn that grains of dirt in cloths can scratch the glass.
Additionally, Sky-Frame notes that seals are treated with silicone from the factory to prevent freezing. If this protection deteriorates over time, apply silicone spray via a cloth (spray onto the cloth first, then apply to seals). And an important detail many people miss: road salt can damage the sliding windows — avoid using it near the system.
These guidelines are solid. What I add as a professional is the technique — the specific method for cleaning large-format frameless glass that produces crystal-clear results while following Sky-Frame's guidelines precisely.
The Professional Technique for Sky-Frame Glass
Here's the method I use and teach — adapted specifically for large-format frameless glass.
Preparation
Sky-Frame's manual recommends a soft cloth and commercial glass cleaner. That works for basic upkeep. But for large-format frameless panels where every streak is magnified across metres of uninterrupted glass, I recommend the professional approach.
Fill a bucket halfway with water — at least 10 litres — and add enough soap to create cleaning power without excess foam. Think of it like washing dishes: enough soap to cut through the grease, but not so much that you're fighting suds. This is the solution I've used professionally for 25 years.
Before touching the glass, brush down the frames and glass of spiderwebs or built-up dust and dirt. This preserves the cleanliness of your tools and makes the whole process more efficient. On Sky-Frame systems, pay particular attention to the base profile and sill track — use a vacuum cleaner to remove soiling from the base profile, exactly as Sky-Frame's manual recommends.
Clear the area around the window. Cover anything that can't be moved to prevent soap water dripping on valuable belongings. Sky-Frame panels are big — water management matters more here than on standard windows.
Agitation — The Step Most People Skip
This is where the actual cleaning happens, and it's the step that separates professional results from amateur ones. Most people skip straight to wiping — but without proper agitation, you're just smearing dirt around.
Dip your T-bar applicator with its microfiber cover completely into the soap water, both sides. Remove excess water with your hand so it doesn't drip. Then apply the soap water to the glass — the whole glass area needs to be covered entirely in soap water to properly loosen the build-up of grime and dirt.
Agitate the dirt with up-and-down or side-to-side motions using the T-bar applicator. The idea is to dissolve the dirt, ready for the squeegee to shave away. If the dirt isn't fully dissolved in the soap water and released from the glass, the remaining dirt still stuck will be transported over the squeegee, leaving smudges or smears.
On Sky-Frame's large panels, this matters even more. Any dirt not fully loosened during agitation becomes a visible streak magnified across metres of glass. Take your time with this step. Stubborn spots like insect dirt need extra soap water and pre-soaking until all build-up is released.
For panels taller than arm's reach, attach the T-bar to an extension pole. Work in sections — top first, then middle, then bottom — keeping each section wet until you're ready to squeegee it. If the soap water evaporates quickly because the glass is warm, you may need to use the applicator and squeegee combo technique: the applicator in one hand, the squeegee following 5-10cm behind in the other, catching the soap water immediately after it's been applied.
Important for Sky-Frame: Sky-Frame warns that grains of dirt in cloths can scratch the glass. Keep your microfiber applicator cover clean — dip and rinse regularly during the job to wash out accumulated dirt. A dirty applicator on premium glass is a recipe for microscopic scratches.
Detail the Frame Before Squeegeeing
This is a step from my Mastery Course that most people don't know about: detail the edges BEFORE you squeegee, not after.
Now that the soap is sitting on the glass and the built-up dirt is dissolved, use your rag — 100% cotton towelling — along the edge where the glass meets the frame or seal. Use your finger pressed into the rag to get into the corners and take away any pooled soap water. This prevents drips running down onto your clean glass during squeegeeing.
On Sky-Frame, the frameless design means there's less frame to detail, but the edges where glass meets glass, floor, and ceiling still need this attention. Clean these edges now while the soap is wet, and your squeegee work will be much cleaner.
The Squeegee
This is where technique matters most on large-format glass. The squeegee removes and collects the soap water on the channel and rubber — and on Sky-Frame panels, you're managing a lot of water across a big surface.
The angle: Tilt the squeegee at a slight angle so the soap water spills out of only one side of the channel — the lower side. If the rubber is jumping, hopping, or squeaking, the rubber isn't lubricated enough with soap water, or the glass is too warm. These are signs to watch for. Re-apply soap water to a smaller area, or wait until the glass has cooled.
Start with a "cut in." This is the first connection of the squeegee rubber to the glass. You can do it "dry" — starting with a dry rubber on a dry edge of the glass — or "moving," which is a more advanced technique where you slice into the soap water at an angle to create a dry starting point.
The turns. On Sky-Frame panels, the side-to-side turn works well for wide panels, and the top-to-bottom turn for tall narrow sections. For the full panel, the mixed technique combines both: use top-to-bottom with a pole for the upper section you can't reach, then switch to side-to-side at arm's height.
Once you've mastered the fundamentals, the Turn with a Twist — the "J" tune — links your movements into one endless, smooth motion from top to bottom. This is how professionals clean large glass efficiently.
Wipe the squeegee rubber dry after each pass. This gives a clean, streak-free start to the following line. On standard windows, a small amount of water left on the blade might not matter. On Sky-Frame's expansive glass, every imperfection is magnified.
Overlap: From one line to another, keep the overlap as small as possible — this means less work and fewer chances for lines. The squeegee rubber should be roughly 3/4 in the soap water and 1/4 out of the soaped area.
Bumping: If soap water accumulates in the channel, bump the squeegee rubber against the glass to release the captured water. Do this at the bottom of the glass to keep dirty soap water away from the clean area above.
For very tall panels, an extension pole is essential. When cleaning with a pole, ensure the squeegee angle is roughly 45 degrees, not flat — if it's flat, you won't remove the soap water correctly. Pole technique requires specific practice. The AR Training Tool lets you build this muscle memory before working on premium glass.
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Finishing — Edge Detailing
Clean away any excess soap water using your finger pressed into your 100% cotton towelling rag. Get into the edge where the glass meets the frame — or on Sky-Frame, where the glass meets the floor, ceiling, or adjacent panel — and remove any pooled soap water.
Always control where the rag is in your hand and make sure it only touches the glass where you need it to collect the soap water. Rotate the rag so you're always touching the glass with a clean section. You need to replace your rag with a fresh one every few windows to keep a high-quality detail.
On Sky-Frame, pay special attention to the bottom edge where the glass meets the sill track. Water collects here and can drip down into the track if not detailed properly. The cleaner your detailing, the less chance of soap water reaching the drainage system and leaving residue.
Professionally speaking, the squeegee turn you use determines how much detailing you need afterwards. The better your squeegee technique, the less cleanup required — which is why training matters so much on premium glass like Sky-Frame.
Track and Drainage Maintenance
This is the step most homeowners miss entirely.
Sky-Frame's sill track includes integrated drainage channels that allow water to exit the system. If these channels are blocked by dust, leaves, or debris, water can accumulate and affect both the sliding operation and the weather seal.
At every cleaning, vacuum or brush out the sill track. Check that drainage openings are clear. Wipe the track rails with a damp cloth to remove any residue that might affect the smooth sliding operation.
Sky-Frame's innovative system layout is designed to make maintenance straightforward — but it still needs to happen regularly.
Gaskets and Seals
Sky-Frame's manual notes that seals are treated with silicone at the factory to prevent them from freezing on. Over time, this protection can deteriorate. When it does, the maintenance is straightforward: spray silicone spray onto a cloth outdoors (not directly onto the seals), then apply to the seals using the cloth.
Inspect seals during every cleaning for cracking, hardening, or gaps. Functional seals are essential for the thermal and acoustic performance that makes Sky-Frame exceptional. If a seal appears damaged, contact your Sky-Frame partner for replacement.
Road Salt Warning
This is a detail from Sky-Frame's manual that many people overlook: road salt can damage the sliding windows. If your Sky-Frame installation is near a road, driveway, or path that gets salted in winter, take care to avoid salt contact with the system. Clean any salt residue promptly if it reaches the glass or tracks.
Cleaning Frequency
Minimum: Twice per year — spring and autumn.
Recommended: Four times per year for urban locations, coastal properties, or areas with high pollen, dust, or pollution.
After construction: If any building or renovation work has occurred near the installation, clean immediately. Cement dust, plaster residue, and paint splashes become extremely difficult to remove once they bond to glass or coatings. Sky-Frame specifically warns about post-construction cleaning — address it immediately.
Regular cleaning prevents environmental deposits from bonding to the glass surface. The longer grime sits on coated glass, the harder it becomes to remove without risking damage. Prevention through regular maintenance is always easier than restoration.
What NOT to Do (Directly From Sky-Frame's Manual)
NEVER use metal blades or glass scrapers. Sky-Frame specifically warns these can cause severe damage to TSG-HST glass. This is the most important warning in their manual — no exceptions.
Do not use abrasive or scouring material. Even products labelled "soft scrub" can create microscopic scratches visible across large glass panels.
Never use cleaning agents containing solvent or scouring material. Solvents can damage the glass and the system components.
Do not use alkalis (lyes). These can attack both the glass surface and the surrounding materials.
High pressure washing is not recommended. The force can damage seals, the drainage system, and push water into areas designed to be weather-sealed.
Watch for dirty cloths. Sky-Frame warns that grains of dirt in cloths can scratch the glass. Always start with clean cloths and microfiber — and if your cloth picks up grit during cleaning, replace it immediately.
Never clean in direct sunlight. This is my addition from 25 years of experience: solution evaporates quickly on sun-heated glass, leaving streaks that are highly visible across Sky-Frame's large panels. Clean in the morning, evening, or on overcast days.
Why Professional Technique Matters on Premium Glass
I've been cleaning windows since 1999 — from standard residential panes to the most premium architectural glass in Vienna and Melbourne. And I can tell you from experience: premium glass amplifies everything. Good technique looks stunning. Poor technique looks worse than it would on a standard window.
Sky-Frame's frameless design is designed to disappear — to let the view become the feature. When the glass is perfectly clean, that's exactly what happens. The glass becomes invisible and the view takes over.
When the glass has streaks, smudges, or residue, the glass itself becomes the feature — for all the wrong reasons. On a small framed window, a streak might go unnoticed. On a 4-metre Sky-Frame panel, it dominates the room.
This is why professional technique matters. Not because the cleaning is fundamentally different, but because the stakes are higher. The same 45-degree squeegee angle, the same consistent pressure, the same streak-free method — applied with the confidence and consistency that comes from proper training.
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Protecting Your Investment
A Sky-Frame installation represents a significant investment — in design, in engineering, and in the living experience it creates. Proper cleaning protects that investment by maintaining the glass clarity, the coating performance, and the mechanical operation of the sliding system.
It's not just a window. It's your view.
And that view deserves professional care.
About the Author:
Justin Orloff is a professional window cleaner with 25+ years of experience and an Orloff's Window Cleaning Training partner with Sky-Frame. He has cleaned premium architectural glass across Vienna and Melbourne, and created the world's first AR window cleaning training platform. Based in Vienna, Austria.
