After getting a little pranking on his stag night, a friend has got flour all over the inside of his car, particularly on the seats, followed up by water over the top. (The flour & water was for him, btw, he jumped into the car, forgetting it was a convertible and had left the top down) Needless to say, it is a real stinker trying to get it out.
It looks like he might have to get it professionally valeted, which is going to cost him about £100, so I wondered if anyone on here had any ideas that might help?