Applying spray foam can be a sticky proposition. No matter how careful you try to be, the stuff always seems to find its way onto surfaces it’s not suppose to. If you’ve created an unintentional sticky mess, clean it up with acetone. A little acetone squirted on fresh foam will dissolve it instantly. No acetone on hand? Acetone is what most nail polish removers are made of. But make sure you get to the foam before it hardens. If you wait too long, there is only one way to remove it, a whole lot of scrubbing.