[JamesCH95]

Originally Posted by techhelpbb

I second that 100% though it's kind of expensive considering I have about 20 gallons laying around at any one time.
20 gallons x $18 a gallon = quite a lot of concentrated potato juice (look up oxalic acid)
Just be careful not to put things with black oxide in it (it will remove it).
Dilluted 'wood bleach' also works but handle that stuff with care (unlike EvapoRust it is much more caustic).

Also you might consider sand blasting or using an 'air eraser' on it.

Planning on powder coating it?

It is indeed expensive, though there are ways of maximizing it's utility. I have used it successfully by soaking a rag or towel with it and draping that over a part. At the end, just squeeze as much as you can back into a container. It helps to have the edges of the rag/towel submerged in fresh evaporust.