I’m dealing with a bunch of Eagle/E series Andersen windows with their “low maintenance” (aka self cleaning) coating. Lots of old paint splatter everywhere. Glass is already scratced up pretty good from previous cleaners, but I’d prefer to not make matters worse.
Andersen says to use denatured alcohol or mineral spirits for stubborn stuff. I just don’t see that taking off the paint in a reasonable amount of time.
They also advise not to use ‘abrasive’ cleaners so steel or bronze wool is out. But what about white or blue scrubby pads?
Alex mineral spirits works, it labor intensive. It a safe solution. We just finished a pella job a few weeks ago with that same issue (paint speckled, and drips.) With the mineral spirits and a white scrubby it still can scratch. Micro fiber towel is the best applicator tool to use.