Murphy's Law, thou that are clean shall soon be........... umm oops, dirty. Poor Martin, at least you could wash it off straight away before it set, that would be so much worse.
Target practice.
Happened a while back driving along, stopped at traffic lights, heard a thud on the roof. No pedestrians around, so just drove on as there was nothing I could do. Got to point B to find the most humungous dollop covering most of the roof. Not enough cloths or detailing gear in that car to clean it off.
Take some detailing with you Mart, just in case that seagull follows you.