Looking at an old roller, it has been stored for years. Cats have gone into it and pee'd. All over..they spray piss too it looks like, as it's on the inside of the doors. I'm sure this is the nature of the beast with cars that are stored..that things get inside and make messes. Anyone picked up a project that had cat pee everywhere? Did it harm the metal? Or does it clean up fine with the metal undeneath perfectly okay?