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Muriatic/Hydrochloric acid should work faster, but is much more of a burn hazard than distilled vinegar. Plus disposal of the used acid becomes more of a problem. An option on plated product is to use a stone to remove the plating then switch to the burrs.

Carbide burrs need to be re-ground. Lots of places offer that service in the tool sharpening field.

A couple tips of acid etching. Not done files so can't comment on how well it will work. Cleaning: you need to degrease the steel well. Oil will protect the steel from the acid making contact. Heat the dip tank: acid works faster/aggressive at higher temps. Heating your dip solution to 100DegF...