tile help

[knoxclean]

My guys cleaned a shower tile ( travertine) and we had some bad residue. They went back did a rinse but customer called and said there is still residue but not as bad. We used oxyblaster cleaner. any suggestions?

View attachment 4127

 

[Mikey P]

Razor blade that crust off.

Flow up With Stone Scrub and a hogs hair pad