Troubleshooting Guide

TB32

Custom’s specially formulated cleaners are an effective ﬁrst step

for removing grout or mortar residue, as well as some mineral

deposits. They are also effective for removing grease, dirt and

other contaminants. They can be used on grout, tile and stone

without harming the surface, and there are no harsh, toxic fumes.

Use according to directions.

Acid washing to remove grout residue or mineral deposits is an

effective cleaning method, if done properly. If incorrect proce-

dures or strong acid solutions are used, the damage to stone, tile

and grout can be substantial. Grout will lose its color or become

powdery or sandy. A strong acid solution will damage and dull

the glazed ﬁnish on most ceramic tile, and also etch or pit the

surface of unglazed tile and stone.

Acid washing can be safely accomplished by using Aqua Mix

Sulfamic Acid Crystals. Follow speciﬁc grout recommendations

for acid washing. It is also effective for concrete etching; as a

relatively mild acid, it does not emit toxic fumes. Sulfamic Acid

Crystals can be used on tile or colored grouts, but should not be

used on some types of natural stone such as polished marble or

granite. Refer to the Sulfamic Acid Crystals Technical Data Sheet

for proper application and handling.