How to Clean and Care for Window Film (and What to Avoid)

Film is applied wet, and the moisture takes time to leave. IWFA, the industry association, says in its inspection guideline: “It should be noted that effects during cure, such as water bubbles, water distortion, and water haze are not to be regarded as defects.”

Madico calls small water bubbles and a slightly cloudy look “normal and temporary,” and says cold, cloudy weather lengthens curing. Avery Dennison, in a European maintenance sheet, says drying “will take several days or weeks to complete, depending on local weather conditions.”

Two cautions from the makers. Do not pierce or press the bubbles. Madico warns that piercing a water bubble “will damage your film” and that the damage is not covered by its warranty, and Avery says not to try to pop or press local bubbles. And a few tiny particles can remain: Solar Gard's Australian page says small particles or “points” may remain and are inherent to film adhesives.

IWFA's consumer FAQ answers the basic question: use a soft clean cloth, soft paper towel or clean synthetic sponge, any normal glass cleaning solution that contains no abrasive materials, and a soft cloth or squeegee for drying. The makers add detail:

• Madico: spray cleaner directly on the glass, then wipe with a clean soft cloth, high-quality paper towel or rubber squeegee in sweeping motions. Household glass cleaner or plain soapy water is fine; nothing with abrasive material.
• Solar Gard (US): most glass cleaners work well, and a good solution is 1/2 ounce of liquid dish soap in 1 quart of fresh water; dry with a soft cloth or soft rubber squeegee.
• 3M (Ultra S800 bulletin): a cleaning agent that is wet and non-abrasive, with a pH between 6 and 8.

Paper towels are one place the makers differ. Madico, IWFA, LLumar and one Solar Gard bulletin list a soft or high-quality paper towel as acceptable. Madico and a second Solar Gard page warn that some brands are coarse enough to leave fine scratches, even on hard-coated film.

This is the biggest conflict in the documents we read, and it is why we will not give you a one-line rule.

• Allowed: 3M's care notices for its Safety & Security, Anti-Graffiti and Sun Control films say they “may be washed with common washing solutions, including ammonia-based products, thirty (30) days after installation.” We read these on warranty forms hosted on a dealer's website, not on 3M's own site.
• Avoid: Solar Gard's Australian page says “Do not use ammonia based or other strong cleaning products.” Avery Dennison's European sheet says “Don't use harsh Ammonia based cleaners!” 3M's own Fasara and dichroic (DF-PA) decorative data sheets say not to use ammonia, chlorine or organic-based cleaning products.
• Silent: on the pages we read, Madico, IWFA and LLumar do not say either way.

The split runs inside single companies: 3M permits ammonia on safety film and prohibits it on decorative film. Product family and region decide, so the care sheet for your specific film is the answer.

A thin gap between the film and the frame is normal. IWFA's guideline says edge gaps will normally be 1/32 to 1/16 inch, and that contact with the frame margin could lead to peeling of the film. Solar Gard's Australian page says not to pick at the edges.

Sacrificial anti-graffiti film is built to be removed. 3M describes its AG4 film as a sacrificial layer that does not chemically bond to glass and is easily removed when replacement is required. 3M's care notice says its anti-graffiti film may be washed 30 days after installation with common washing solutions, no abrasives or bristle brushes.

Here is where we stop. We checked 3M, Solar Gard, LLumar and Madico documents and found no list of chemicals that are safe for graffiti removal on the film surface. The ammonia permission above covers routine washing; we would not assume it extends to solvents. Ask your installer or the maker before putting a solvent on sacrificial film. More on that in our sacrificial layer guide and on our anti-graffiti film page.

These are worth a phone call:

• Haze or bubbles that outlast a normal cure. Avery Dennison says that if a window still looks foggy after several weeks, contact your installation company.
• Edges lifting or peeling. IWFA's inspection guideline counts edge lift among the conditions judged on a finished installation, and contact with the frame margin could cause peeling. Call rather than pressing it down yourself.
• Scratches. If you see scratches, stop and note what was used. Whether a scratch is covered depends on your warranty wording and how it happened, and we cannot say without seeing it.
• Fogging between the panes of a double-pane unit. That is a failed seal inside the glass unit, not a cleaning problem.

If a janitorial service cleans your windows, Solar Gard's advice is to make sure they receive a copy of its care bulletin. We agree: give your crew the care sheet for your film.

Care instructions are written for specific products and regions. We read these in October 2026; makers update their sheets, so use the current one for your film.

1. IWFA, Architectural Visual Inspection Guideline For Applied Window Film, January 1, 2020. PDF.
2. IWFA, Frequently Asked Questions. Page.
3. Madico, Window Film Installation, Care & Maintenance (M956201). PDF.
4. Solar Gard, Care and Maintenance (US). Page.
5. Solar Gard, Care and Maintenance of Window Film (US residential bulletin). Page.
6. Solar Gard Australia, Care and Maintenance. Page.
7. 3M, Anti-Graffiti Film AG4 Technical Specifications, Rev C, January 2025. PDF.
8. 3M, Scotchshield Ultra S800 Product Bulletin, October 2021. PDF.
9. 3M warranty and care forms for Safety & Security, Anti-Graffiti and Sun Control films, as hosted on a dealer's website (not 3M's own site). Safety & Security form.
10. 3M Anti-Graffiti Window Film warranty form (dealer-hosted copy). Anti-Graffiti form.
11. 3M Sun Control Window Film warranty form (dealer-hosted copy). Sun Control form.
12. Avery Dennison, Solar Films Maintenance Recommendations (Europe). PDF.
13. Avery Dennison, Auravate Blue Sandstone product data sheet, Rev 0, 08/21/24. PDF.
14. LLumar, Architectural Window Film FAQs. Page.
15. LLumar, Exterior Safety Series guide specification, Section 08 87 13. PDF.
16. 3M, Fasara Glass Finishes Technical Data Sheet, Rev P, March 2022. PDF.
17. 3M, Dichroic DF-PA and DF-LAM Technical Data Sheet. PDF.
18. Designtex, Casper Cloaking Technology Installation Instructions (PF101). PDF.
19. Gauzy, Smart film CSI specification. PDF.
20. Solar Gard, Graffitigard anti-vandalism sell sheet. PDF.