One of my favorites is to get your self a large quantity of liquid dish soap, 5 liters at least, and completely cover his vehicle, paying some extra attention to the windows. Let him know about it right away so it doesn't bake onto the car! It doesn't really hurt anything, but will usually cost somewhere in the $40-$50 range at the car wash to get it all off! And make sure you watch him as he goes to leave for the carwash, because the first thing he will do is hit the wipers! lol
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