White Stains on Vinyl Siding (Pesticide?)

Has anybody ever dealt with white stains on vinyl siding? The customer thinks it’s from a pest control company that sprayed a spider control pesticide. The other theory is that the previous pressure washing guy used a Carnuba wax in his house wash mix and it dried on the vinyl. I’m leaning toward the pesticide because it’s nowhere on the lower portions of the house. When I get up close and rub it with my finger its gummy feeling. Anybody know what chems might take this off? Any help is appreciated.

Gutter butter and a brush.

You’ve had this issue before? I don’t want to just start brushing random chems on his house and wind up brushing the whole house.

Sounds like fallout potentially.

Not to sure if you have seen this, but is from a conversation from last year. Not the same stain but maybe helpful

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