Mighty you can clean it up. there is some stuff that I used on other metal gas tanks on motor cycles and small engines. it has two parts one that gets rid of all the rust and trash out and then you put the coating in that seals the tank its a silver color. you have to remove everything from the tank to use the stuff. And after that you have no more problems. I'll try and findout the name brand I don't have any right now so not sure of the name.