Last year I was working getting these black little specs off front window
and door pane. I actually scratched the window storm pane. Piece of
aluminum no good for scraping. Razor ok, no scratches. They are really
stuck on good. Yes, I got mulch in the area. From reading, certain mold
lives in mulch which shoot out these projectiles. Bet that would hurt my
eye. Thought it might have been eggs.
Done any spray painting? A razor scraper with a fresh blade is the best
(only?) tool to use. If it isn't paint, it is probably bug poo. I
don't remember what kind used to mess on my windows in Florida.
Razor blades do work great for cleaning all manner of foreign stuff off
windows, but keep the window and blade very wet with water while you do
it, otherwise you'll still get small scratches. I used to clean new
construction houses for a living (prior to the houses being turned over
to the new owner) so I've spent hundreds of hours doing this.
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