If acid alone is used on a concrete surface with a bond breaker present, it will not acid etch the floor, will not remove oils, and will not remove coatings, sealers, etc… because acid is not a degreaser or a remover. Oils may only be temporarily "

Acid etching is the process of applying hydrochloric/muriatic or buffered phosphoric acid to a slab, then rinsing it off with water. For many years, it was a standard method of concrete preparation used by nearly all industrial, commercial and institution

When you acid etch concrete, wear long sleeves, gloves, eye protection, and a face mask to protect yourself from stray acid. Then, mix 3 or 4 parts water with 1 part muriatic or hydrochloric acid in a plastic bucket.