Forster Profilsysteme — Window Cleaning Guide

Quick Facts

Brand at a Glance

Product Range

Why This System

Step 1 of 2: Manufacturer Recommendations

Official Care Guidance

Glass

• ✓Lukewarm water with mild dish soap or purpose-made glass cleaner. No ammonia on coated glass.
• ✓Microfibre T-bar applicator on wash, professional squeegee on pull. Fresh rubber.
• ✓On large glass panels, use an extended squeegee channel and overlap passes carefully.
• ✓No razor blades - check for coatings first. Toughened glass in Forster systems may carry surface treatments.

Frames

• ✓Soft cloth with pH-neutral cleaner only. No abrasive pads, no scouring products, no steel wool near steel profiles.
• ✓No solvent-based products near intumescent seals in fire-rated systems.
• ✓No alkaline or acidic products on powder-coated steel - both attack the coating over time.
• ✓Dry all steel surfaces immediately after cleaning - standing water on or around steel profiles causes rust staining at drainage points.

Hardware

• ✓Wipe all hardware with a damp soft cloth and dry immediately.
• ✓Lubricate pivot hinges and locking mechanisms with light machine oil annually.
• ✓Check for rust spots at hinge mounting points and locking hardware fixings - these are the first corrosion points if powder coat has been scratched during installation.

Step 2 of 2: The Orloffs Protocol

The Orloffs Protocol

Pro Tools

My daily tool list. This is what I carry to every job.

Follow these steps in order. Each one builds on the last. This is the same sequence I use on every Forster Profilsysteme installation.

1. 1

   Preparation -- before any water touches the glass

   Fill the bucket with at least 10 litres of water. Add soap for cleaning power -- enough to cut through environmental deposits, not so much you are fighting foam.

   Before touching the glass, brush down the surface to remove loose dust, spiderwebs, and debris. Any grit left on the glass during the wash phase risks scratching during agitation.

   Check the aluminium frame condition before you start. Confirm which cleaning product is safe for that surface before opening any bottle.

   Cover anything below the windows that cannot be moved.

2. 2

   Agitation -- apply and work the solution

   Dip the microfiber T-bar completely into the soap water, both sides. Remove excess water with your hand so it does not drip. Apply the solution across the entire glass surface with overlapping passes.

   The goal is to fully dissolve and release every deposit from the glass surface. Anything not released during agitation gets transported across the glass by the squeegee as a smear.

   For stubborn spots -- insect marks, salt residue, environmental deposits -- re-apply soap water and allow it to soak for a full minute before agitating again. Use more soap water, not more pressure.

   For panels above arm reach: attach the T-bar to an extension pole. Work in sections -- top first, then middle, then bottom -- keeping each section wet until you squeegee it.

   Rinse the T-bar cover regularly during the job. A dirty applicator causes microscopic scratches that accumulate over time.

3. 3

   Detail the frame edge before squeegeeing

   Use your 100% cotton towelling rag, finger pressed into the fabric, to work into every junction and remove pooled soap water before the squeegee pass.

   This prevents drips running down onto already-cleaned areas during squeegeeing and keeps soap water out of drainage channels.

   On Forster Profile aluminium frames, pay particular attention to the bottom edge where glass meets the frame sill -- water pooled here runs into drainage openings and leaves residue over time.

4. 4

   The squeegee

   Tilt the squeegee at a slight angle so soap water spills from one side of the channel only -- not both. If the rubber is jumping or squeaking, either the rubber is not lubricated enough or the glass surface has warmed.

   Cutting in: start with the rubber blade making first contact on a dry edge of the glass.

   Side to side: horizontal passes across the panel. Works well on wide sections. Top to bottom: vertical passes down the panel. Works well on tall narrow sections.

   The J tune: one smooth unbroken motion top to bottom, wrist rotating at each end to reverse without lifting the rubber. The most efficient method on larger panels -- but it requires training before applying it to premium glass.

   Wipe the rubber dry after every pass. Overlap each stroke by 2-3 cm.

5. 5

   Final edge detailing

   After squeegeeing, there is always a residual line of water along the bottom edge and at the panel sides. Take a dry cotton rag, fold to a clean corner, and detail these edges in one smooth pass.

   On Forster Profile frames, the bottom edge where glass meets the sill requires the most careful attention. Water left here runs into drainage and leaves residue that affects the next clean.

   Rotate the rag to a clean section after every pass. If the rag picks up grit at any point, replace it immediately.

6. 6

   Frame wipe and hardware check

   On Forster Profile powder-coated aluminium frames: use pH-neutral cleaner only, never abrasive pads or steel wool. Dry immediately after wiping.

   Check that all drainage openings are clear and unobstructed. Water must be able to flow freely -- a blocked channel leads to accumulation that affects seal performance over time.

   Operate every opening window through its full range. Stiff handles or resistance at locking points indicate hardware that needs lubrication. Flag it to the owner rather than forcing it.

Pro Tips

• ★ On Forster unico systems in cold months, the inner profile face may be cold or show condensation when you arrive. Let the interior warm up before cleaning the inside face - a cold wet profile takes much longer to dry and increases moisture exposure time.
• ★ Use a torch to check inside drainage channels on Forster frames - the channels are narrower than on PVC systems and debris blocks them faster.
• ★ On heritage renovation projects, distinguish between original steel frames and new Forster profiles before starting - original steel may be in a restoration or conservation phase and should not receive standard cleaning products.
• ★ Dark powder-coat colours on premium Forster projects show fingerprints and cloth marks more clearly than standard window frame finishes. Use a lint-free cloth for the final dry pass on dark frames.
• ★ Scratches in powder coat on steel profiles need to be reported promptly. A small scratch treated with touch-up paint within a few months of discovery prevents a rust problem that requires full refinishing to resolve.
• ★ On Forster fuego fire-rated systems, note the location of intumescent seals on your first visit and mark them on a site plan. Any product application near these seals at subsequent visits needs to avoid the intumescent material.
• ★ Large commercial Forster facade elements may require water-fed pole technique rather than traditional squeegee access. Assess whether the installed glass area and height are within the safe reach of your equipment before starting.

What NOT To Do

Bundle Kits and Tool Recommendations

Cleaning Frequency

Glass: 2x to 4x per year (Commercial and heritage projects often specify quarterly cleans. Residential: spring and autumn minimum.). Frames: Same schedule as glass (Steel profiles benefit from regular cleaning to prevent grime from holding moisture against the powder coat.). Corrosion check: Every clean (A 2-minute inspection for rust initiation points is the most important maintenance task on any steel window system.). Hardware lubrication: Once per year (Steel pivot hardware dries out faster than PVC or aluminium hardware in exterior exposure.)

Frequently Asked Questions

Field Notes

“Steel window systems are the most demanding material category for field cleaning. The combination of abrasion sensitivity, moisture management requirements, and the long-term corrosion risk from even small damage makes the steel protocol the strictest in the industry. Forster unico systems in residential settings are often in contemporary architect-designed properties where the client has very high expectations for finish quality. The slim profile and large glass area make any mark on the frame visible from across the room. Heritage renovation projects with Forster profiles alongside original steel windows require a dual protocol - know which product is which before applying anything.”

Justin Orloff