I'm doing an upcoming short film and need advice from someone who's done art direction. In the story we're doing, a guy has doodles & saying painted on his car (like with a paint brush). I'm trying to find a way that I can paint some words on a car that will wash off cleanly with just soap and water and not leave any marks behind after. My current thought is to do a test with crayola washable paint and see if that works. I'm trying to avoid having to composite the 'artwork' on in post because the car is basically in the background of every other shot. Does anyone have any suggestions as to how I can pull this off?