[Banshee]

Most of the rust removal products mentioned are variations of Phosphoric Acid. It can be had in food grade "oxy solve" or industrial grades. Difference being concentration.

Muriatic acid also converts rust but will eat thin metal and alloys.

Behr produces a floor prep product called croncrete etcher and rust remover that sells for $10 a gallon.

I have used all the forementioned products except the "safest rust remover" and have found for $10 a gallon, the results are exactly the same.

This product will completely remove all rust from the worst part you have in 15-20 minutes without harming the metal. I have left parts in there for days without issue.

Place a rusted bolt in a can of Coca Cola for 2 days and it will come out rust free..Look at one of the ingredients.