plain household vinegar will remove that rust. Just put a couple of gallons in the tank and slosh it around for about 15 min or so.
There may be a vinegar flavor to the water depending on how much you use and how long you leave it there but someone can probably tell you how to kill that flavor. I doubt that there will be much considering how much water the tank holds compared to how much vinegar residue will be left in the tank.
The good thing about this method is that nobody gets poisoned and a small amount of vinegar is actually supposed to be healthful.
Bleach hardly affects rust and it is definitely poision if too concentrated.
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Ernest Jenkins
2005 Newell Thunder
Shakin the open road!
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