What cleaning steps are essential before installing window film?

Hey, I’m planning to apply frosted vinyl to my bathroom windows tomorrow and wondering — how clean is “clean enough” before applying the film? I wiped it down with a regular spray and paper towels. Is that good enough?

I’ve done a few installs and trust me — surface prep is everything. For windowfilm to really stick well, you need to clean off every trace of grease, dust, or residue. I once skipped a full cleaning and the film peeled after a week. I learned my lesson on https://applyityourself.com — they recommend using ammonia-free glass cleaner and even a blade scraper to remove invisible grime.

Good to know — I was gonna use just water and microfiber. I’ll definitely step it up with the cleaner and scraper next time.

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