There are several de-rusting options. There are dozens of threads on here arguing about it, promoting one over the other, doing tests, etc. Let me save you the trouble. There is no one right answer or one wrong answer. It all depends on your prerogatives. There are trade offs to all of them with respect to cost, time (or strength/power), cleanup, and hazard.
If you're referring to Evaporust or Metal Rescue, as I suspect you are, they are quick, easy, non-toxic, and there is literally no cleanup other than a rag, but costly.
Household muriatic acid (toilet bowl cleaner) is faster and cheaper, but it contains 10% HCL acid, will burn your skin, makes fumes, cleanup is messy, and you have to rinse, dry, and get oil on them immediately or they will fuzz up with surface rust as soon as they hit the air.
Industrial muriatic acid (pool cleaner) is even faster, also cheap, but it contains more HCL, has to be diluted, and the cleanup and instant oxidation is even worse.
E-tanks are the cheapest solution in the long run, but they have an upfront cost, don't work quite as fast as Evaporust, and they do represent a hazard around children and pets.
Vinegar is safe and relatively cheap, but slow, and it smells; molasses is even slower and, needless to say, messy
LUG: thanks for the 411!!
also just to add to the vinegar it will keep eating your cast iron and steel if not rinsed off and wiped dry.
just curious do you put any preservative like Fluid Film, BLO or any other product to keep your old tools shiny after you clean them up?
ALL: i'm getting close to having a spot to finally hang up my Williams 3/4 inch socket set board which i think I have most of the set to hang on it. Wall space at my place is a premium so this is my first tool board i'm able to hang.
stay tuned!!