Great Stuff Pro Foam Gun Cleaner works great to clean out a spray foam gun and clean off the top of a partially used can of spray foam. If you're using spray foam guns, I don't know of any better product. Individual cans usually sell for around $7.50. I paid $72 for this case which works out to $6 per can. The box was falling apart a bit when I received it, but there's no damage to the cans so it's the best price I've found.