Regular vinegar will also do the job.
grbyrns@ucdavis.edu wrote:
> I finally found something one can buy legally in California that cleans out
> the rust and varnish from an old gas tank. I used "CLR", a household
> cleaning product for lime scale and rust removal. It comes in a gray
> plastic jug. It has sulfuric acid and a bunch of surfactants in it. I let
> it stand overnight in the bottom of the tank and it is bright (if somwhat
> thinner)metal this morning. Now to flip it over and see if there is any
> 'oomph' left for the same gallon to clean the top of the tank. It works
> pretty well, as it seems to have removed all traces of rust and varnish from
> the metal to the depth it stood in the tank.
>
> Things I tried that didn't work well, or at all:
> Laquer thinner
> paint and varnish remover
> phosphoric acid
> paint thinner
> nuts/bolts/shaking till your arms fall off
>
> Regards,
> Glen 'arms still too sore to type' Byrns
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