There's something else that a marine based product...totally blanking on what its called, comes in a gallon jug. Thats what I used on my horse trailer to get rid of the rust on the roof. It turned the rust and transformed into a shiny surface, really cool!

ETA: I think this is it.

Never-mind...remembered. It was this:

"The surest sign that intelligent life exists elsewhere in the universe is that they haven't tried to contact us yet."