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what to rinse my gas tank with?

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    #16
    I keep a 20 or 30% solution of phosphoric acid made up for just this kind of thing. Marvellous for treating rusty steel, then wash off before painting. I have a trailer that was de-rusted three years ago, been left outside since and not a trace of rust re-appearing on it anywhere. Considering the paint was cheapy household interior/exterior grade, it's doing well.
    ---- Dave

    Only a dog knows why a motorcyclist sticks his head out of a car window

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