Hey all, just dropped my gas tank to install a new one that's not coated in rust and I noticed some bare metal showing where my undercoating has worn off. I'm pretty sure I'm going to just spray it with some rustoleum paint and be done with it... but after searching the forums I couldn't find anything about how in depth I need to clean the area before I spray it? Does it need to be completely clean? If so, what would you suggest cleaning with? I'm on an extremely tight budget unfortunately so things like por15 are out of the question. Thanks!!