What is the best way to clean old equippment.

[hillegom]

I had some muriatic acid once, used it to remove concrete from a rock wall. It dissolves
the concrete binding agent and leaves you with sand.
But I can't remember. If you want to dilute it, do you add water, or do you add the acid to the water. I remember there is a big saftey issure here, if you do it incorrectly,

[banditpowdercoat]

Acid to water, that way, if you splash, the water splashes not the acid.

Also, if there is a reaction, adding the acid first makes it start out REALLY diluted. If you add water to the acid, the concentrations are reversed

[TrailFish]

Try pickling vinegar it is a couple of percent stronger (7% vs 5%) and about the same cost.

[ALBERTA REEF]

Ok I have tried everthing except Muriatic acid (AKA hydrochloric acid). I like to be on the safe side of things. I found the safest way is to use pickling vineger 7% with a heater and a pump. Works the best. thank you for all the advise.