Cleaning Vinyl Siding

I would first see if they come off with water and agitation with a soft brush. The spot might be water soluble and easily removed this way. If the spots are persistent and not easily removed with water, maybe try a simple degreaser or all-purpose cleaner. Follow directions on container and start with a medium strength solution. Be gentle, and test a spot to make sure there will be no bad reactions.

I would also recommend calling the Exterminator and asking them to remove the stains. They should be very aware of the stains their product leaves behind, and should have told you this might happen and allowed you to possibly choose another form of exterminating.