If you have a few rust bumps perhaps just use BB's from your local Walmart sports dept. Fill the tank with one pack of BB's (holes plugged) and shake, rattle & roll for a few minutes to break the rust bubbles. Use the warm chrome cleaner solution to clean it out. Let the cleaner work for a few minutes and rinse well. While the tank is wet inside, spray well with WD40 to chase as much moisture out and allow to dry. Note: If you want to protect the paint on the outside of the tank, coat the outside with a light coating of chassis grease. When your finished rinse the grease off with WD40 and then with soap & water.
If the tank is going to sit without fuel for a while, just hit it again with WD40 or the like.
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