Re: How to remove paint overspray from windows???
I own a window tinting business...
If it's glass, yes use a fresh razor(such as from Home depot-small 2 inch wide with holder).
But anytime you use a razor on glass, you want to make sure you have slip agent. Whether that be water or window cleaner, etc... You never want to run a razor across dry glass. Slip "lubricates" so the razor does not scratch the glass.
Also, for plexi, the best thing to use would be a plastic razor(car detailing type-any professional paint/car detail store has them). Similarly, use slip solution(glass cleaner, baby shampoo dilute in water)...
Hope this helps...remember, never run the razor on dry glass! No need to use WD-40, etc...
Mario