Need advice

What is the best way to remove these spots?

Tried a scraper but had no luck, I think it’s overspray from spider proofing the house.

Try this with some steel wool - Diamond Magic | Stain Removal | WCR – WindowCleaner.com

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Thank you, i’ll give it a try

Nope. It has nothing to do with pest control. I was in that biz for > 20 years. Sometimes when things won’t come off with a razor, try a magic eraser; otherwise, a chemical treatment.