Where can I find a spray paint that i can wash off of a car?

I'm trying to decorate the body of my friends car but I don't want to do anything permanent. I've heard of a spray paint used for cars that comes off. Does this really exist, does it really and if so where can I find it?Where can I find a spray paint that i can wash off of a car?
try ebayWhere can I find a spray paint that i can wash off of a car?
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