
North America Β· Holding Company
Ply Gem Industries β Window Cleaning Guide
πΊπΈ USA Β· Last reviewed by Justin Orloff
Quick Facts
founded
1943
hq
Cary, North Carolina
primaryMaterials
Vinyl (uPVC) across all window brands in the group
glazingPartner
In-house and third-party (varies by brand)
marketTier
Entry to Mid-Range across the portfolio
Brand at a Glance
- Country: USA
- Corporate name: Cornerstone Building Brands (formerly Ply Gem)
- Founded: 1943
- Window brands in group: Simonton, Great Lakes Window, Atrium Windows
- Other products: Vinyl siding, roofing, gutters, trim
- Scale: One of the largest exterior building products groups in North America
- Climate context: USA national - brands cover all US climate zones
Product Range
- Simonton Windows
- Great Lakes Window
- Atrium Windows
- Exterior building products
Why This System
The group model means a professional who understands one Ply Gem vinyl window brand largely understands the others. Common manufacturing standards and shared engineering result in consistent cleaning requirements across Simonton, Great Lakes, and Atrium. Ply Gem exterior products - siding, trim, gutters - appear on properties alongside Ply Gem windows. Be aware of chemistry compatibility when cleaning both windows and exterior products on the same visit. At the group level, Ply Gem represents the volume mid-market of US vinyl window manufacturing. These brands collectively cover a very large proportion of USA new construction and replacement residential windows.
Step 1 of 2: Manufacturer Recommendations
Official Care Guidance
Step 2 of 2: The Orloffs Protocol
The Orloffs Protocol
Since 1999 I've cleaned hundreds, if not thousands, of different window brands and systems. The physics of clean glass don't change from one brand to the next. Follow the steps below and you'll clean your Ply Gem Industries windows to a professional standard β guaranteed.
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 Ply Gem Industries installation.
- 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 uPVC 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
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
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 Ply Gem uPVC 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
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
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 Ply Gem 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
Frame wipe and hardware check
On Ply Gem uPVC frames: solvent-free pH-neutral cleaner only -- solvents cause permanent surface damage. Avoid abrasive pads on the profile.
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
- When quoting new construction developments built with Ply Gem group windows and siding, price the whole exterior envelope rather than windows alone - the group product presence makes it natural to position for everything.
- Simonton, Great Lakes, and Atrium screens are manufactured to similar specifications and are often interchangeable within a product tier. If a screen is missing or damaged on a Great Lakes window, the Simonton replacement may fit.
What NOT To Do
- Do not use solvent, abrasive, or alkaline products on any Ply Gem group vinyl window
- Do not allow siding or exterior cleaning chemicals to migrate onto window frames
- Do not exceed 3% bleach concentration for mildew treatment
- Do not neglect weep hole maintenance across any brand in the group
Bundle Kits and Tool Recommendations
Bundle Kit
Cleaning Frequency
Clean every 4β8 weeks depending on environment.
Frequently Asked Questions
Field Notes
βKnowing the Ply Gem parent relationship means that Simonton, Great Lakes, and Atrium expertise transfers between brands. A cleaner confident on Simonton can approach Great Lakes and Atrium with the same protocol. Properties with Ply Gem windows often have Ply Gem or Cornerstone vinyl siding. Offer a whole-exterior maintenance service - the chemistry compatibility across the product family simplifies the approach.β
Justin Orloff
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