I thought maybe I should install my two cents
I have been de rusting these pieces of iron for a while now
The best system I had was a cut off 1000 gal round poly tank with the good old lye mix and a welder set at about 80 amps
( just don/t stick your arm in without turning off the welder)
it not only heats the solution but also get rid of rust in a hurry
if the polarity is reversed you can also age the new material so it looks like the rest of the vehicle
The solution will last for years only need freshened up with more lye or with more water, scoop out the bottom of the tank every so often and take the remains to the scrappy or put spread it on the lawn ,Sure make s the grass green the following year
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