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The right tools, solutions, and technique for cleaning hurricane impact glass in Florida — without voiding your warranty or damaging the laminated layers.
Impact windows are not just thick glass. They are a laminated assembly — typically two lites of tempered or heat-strengthened glass bonded together with a polyvinyl butyral (PVB) interlayer in between. This PVB film is what holds shattered glass in place during hurricane-force impacts rather than allowing it to explode inward.
This construction creates cleaning challenges that don't exist with standard single-pane windows. The outer glass lite, while tempered, is often thinner than you'd expect — and the PVB film below it can be damaged by sharp objects or abrasive materials that create micro-cracks in the glass, providing pathways that reach the interlayer. Once the PVB is compromised, the structural integrity of the window is reduced and delamination (cloudy, bubbling separation between layers) can begin.
Additionally, many modern impact windows — particularly from brands like PGT, CGI, and Andersen — feature a soft-coat low-E (low-emissivity) coating applied directly to one of the interior glass surfaces. This coating is microscopically thin and improves energy efficiency by reflecting infrared heat. It is extremely sensitive to abrasives and certain chemicals. Unlike the hard-coat low-E used on some commercial glazing, soft-coat low-E can be wiped off with an abrasive cloth.
In Florida's coastal environment, impact windows face additional challenges: salt spray deposits hard mineral residue, high humidity promotes mold and mildew on frames and seals, and construction dust from the constant building activity across South Florida creates a persistent gritty film on glass surfaces.
The list of products and tools that can permanently damage impact glass is longer than most homeowners realize. If you've been using any of these, stop immediately.
Professional window cleaners who work on impact glass regularly use a very specific toolkit. It's not complicated — but each element is chosen for a reason.
The gold standard is a pH-neutral window cleaning concentrate mixed with water. Brands like Titan Labs, Unger, or GlassRenu make solutions specifically formulated for impact and low-E glass. In a pinch, a few drops of plain dish soap (not antibacterial, not citrus-based) in a bucket of water works well. What matters is neutrality — acidic and alkaline cleaners both attack the soft-coat low-E surface over time.
Avoid products marketed as "streak-free" that contain isopropyl alcohol — they can leave residue on low-E coatings and potentially cloud the coating on soft-coat surfaces with repeated use.
A lambswool applicator sleeve on a standard T-bar is the preferred application tool for professional window cleaners — it holds solution well, glides smoothly, and is incapable of scratching glass. Microfiber scrubber pads rated for glass are a close second and more widely available for DIY use. The key characteristic to look for: zero abrasive content. If a pad has a scratchy side, that side never touches impact glass.
Use a high-quality squeegee with a fresh, undamaged rubber blade. Cheap squeegees with rigid plastic channels can crack, and a cracked channel drags across glass leaving arcing scratches. Replace rubber blades regularly — a nicked or hardened blade leaves streaks and can drag grit across the surface.
Pro Exterior uses the right tools and techniques for hurricane impact glass — including water-fed pole systems that protect your windows and your warranty.
View Our Window Cleaning ServiceBefore applying any solution or touching the glass with a scrubber, rinse the entire window surface with a garden hose on a low-pressure setting. This removes loose salt crystals, dust, pollen, and grit that would otherwise be dragged across the glass surface during scrubbing — causing scratches.
Do not use a pressure washer on impact windows. Even 1,000–1,500 PSI directed at the frame or seal area can force water past the rubber gaskets and into the frame cavity, promoting mold growth in areas that are nearly impossible to dry out. Impact windows are sealed differently from standard windows — the gaskets are not designed to withstand sustained pressure washing.
Mix your cleaning solution per the manufacturer's dilution ratio, or use a few drops of dish soap in a bucket of clean water. Load a lambswool sleeve or microfiber applicator pad and apply solution generously to the glass surface. Work in sections — one window pane at a time — especially in direct Florida sun where solution can dry before you squeegee it off.
If working in strong direct sunlight, wet the glass with plain water first, then immediately apply your cleaning solution. This buys you extra working time before the glass dries.
Gently scrub the glass in overlapping strokes using the microfiber pad or lambswool sleeve. For areas with mineral deposits or salt buildup, apply a bit more solution and scrub in a circular motion — let the solution soften the deposit rather than forcing it off with pressure. If a deposit won't release with repeated wetting and light scrubbing, use a plastic scraper (never metal) held at a very low angle on thoroughly wet glass.
Pay attention to the edges where glass meets the frame — salt and mineral deposits accumulate heavily there. Use the corner of your applicator to work solution into those edges.
Place the squeegee blade at the top corner of the glass and pull across in a single smooth stroke. Wipe the blade clean with a folded microfiber cloth after each pass. Overlap each stroke by about an inch. On large panes, use the "fan" technique — start at one side and arc the squeegee across the pane in a fan motion for fewer blade lifts.
Avoid pressing hard into the glass — a good squeegee with a fresh blade requires almost no pressure to pull cleanly. Hard pressing increases the risk of dragging any remaining grit across the surface.
Use a clean, damp microfiber cloth to wipe the remaining solution from the window frame edges and any water that pooled on the sill. Inspect the rubber gaskets and seals around each pane while you're up close — look for cracking, gaps, discoloration, or separation from the frame. Catch a failing seal early and you avoid water infiltration and the associated frame rot or mold growth.
Clean the frames with a damp microfiber cloth and a drop of mild all-purpose cleaner. Rinse well. Avoid getting harsh cleaners on the rubber seals — they degrade rubber over time.
Interior impact glass cleaning is more forgiving in one sense — you're not dealing with salt spray or heavy environmental soiling — but it requires the same tool standards. The interior glass surface (or the interior face of the inner lite) may have the soft-coat low-E coating applied directly to it, making it even more sensitive than the exterior surface.
Use the same pH-neutral solution, microfiber applicator, and squeegee technique for the interior. Keep in mind that most of the streaking people see on interior glass comes from cleaning solution residue — which is a sign of either a dirty squeegee blade, leaving solution to dry on the glass, or using too much soap in the mix. A thin film of solution, properly squeegeed, should leave no residue.
For the interior, wiping with a slightly damp clean microfiber cloth as a final detail step picks up any remaining moisture at the edges and produces the crystal-clear finish that distinguishes a professional result from a DIY one.
Impact window frames in South Florida are most commonly extruded aluminum with a white or bronze anodized finish, or vinyl (PVC) frames used in some residential installations. Both require different care.
Anodized aluminum cleans easily with a pH-neutral all-purpose cleaner and a microfiber cloth. Avoid acidic cleaners — they strip the anodized coating, leaving bare aluminum that oxidizes and pits. If you see white chalky oxidation on older aluminum frames, a mild aluminum brightener applied carefully can restore the finish — but test in a hidden area first.
Vinyl frames can yellow over time from UV exposure. A product like Rejuvenate Outdoor or similar UV-restore spray applied after cleaning can help restore whiteness. Avoid silicone-based sprays on vinyl — they attract dust and can leave frames looking worse after a few weeks.
The rubber gaskets sealing glass to frame on impact windows are critical structural components. Clean them with a damp cloth and nothing harsher than water. Petroleum-based cleaners and some solvents will swell and degrade EPDM rubber gaskets over time. If a gasket is cracking or pulling away from the frame, it needs replacement — not just cleaning.
The cleaning frequency for impact windows in South Florida depends heavily on how close to the ocean or Intracoastal you are.
The common mistake is waiting until windows look visibly dirty. By that point, mineral deposits have had weeks or months to bond to the glass surface, making removal harder and riskier. A regular light cleaning is always easier than an infrequent heavy cleaning that requires more aggressive agitation.