Muriatic is a 33% dilution of hydrochloric acid, the main drawback/risk of using it is its propensity to form an acid fog that will coat every bit of steel (even stainless) in the room/building with a layer of very active rust, do not play with it in the same building your collection is housed in!!
I once got to check out 12 brand-new stainless elevators that needed to be replaced when the flooring contractor washed the newly-laid granite floor with muriatic to remove grout residue... expensive!
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