On the north facing windows in Northern California, I noticed these poop-like splatters stuck on the glass. Some of the homeowners thought it was bird poop, others think it’s bee / insect poop. What ever it “is/was”, it was difficult to remove. I didn’t use a razor; though I probably could have, I just used wool. Well, I don’t ever remember having to “hand-sand technique” something so much since wood shop in high school. Well I did remove it without scratching the windows, but should’ve definitely spent more time during the estimate to adjust cost for it. I did however get a decent tip out of it, so it evened out I guess.
Do you know what it is?
where in norcal?
East San Jose.
if its yellow my understanding is bee droppings
when its baked on over time/temperature its a bear to remove or at least a 2 step process of blade and wool
wpole’s nemesis
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Thanks for the poop 
info!
Looks like bug poop
Dwell time with solution will soften it for easier work…then you may have chem. run down. Catch 22. Nice outcome…yer a pro. Just another day at the office.
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I used to always think it was some kind of bug poop but sounds like artillery fungus. Especially since you say it’s on the north side.
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That’s definitely not artillery fungus, those are tiny round black dots that get blasted from old, wet mulch in humid climates. I’ve certainly seen my fair share.
