Did you try an acid wash to see if any of that was just bleach/soap residue from a stupid mopper?That's with double strength Tsunami, stripper boost, Nylagrit 175 super slow pre scrub and 1200 psi turbo rinse...
Yes. Straight up for a test spot. Muriatic acid. But, if the 50/50 had no effect, probably a waste of time. May need a top of the line stripper with generous dwell.Are you asking if I used undiluted acid cleaner?
No my next Prochem's restoration acid 50/50 and not even the slightest fizz or effect