Expert Answers in Stains

ANSWER – If the dirty condition is actually a cementitious residue then a diluted phosphoric solution of acid should clean it.  If the residue is from a polymer modified adhesive, then you might need a…

ANSWER – If you have a number of wet/dark spots on your newly installed marble slabs, it may be that the marble slab was installed in a spot bonded method.

If the marble slab was…

ANSWER –  The TEC 550 Power Grout says it is a unique cementitious formula, and that its unique formulation is stain proof* and provides strong, color consistent joints free of efflorescence that is resistant to…

ANSWER – If you have dark stains at the seams of the limestone fireplace, that suggests that the stone installer used a sealant or resin for those joints that bleed into the stone leaving a…

ANSWER – It depends on whether the water from the commode was contaminated or not.  Category 1 water is sanitary water.  Category 2 water is contaminated water to some degree. Category 3 water is grossly…

ANSWER – Cementitious grout is porous and more susceptible to staining and shade variation than an epoxy or urethane grout.

It is possible that the difference in grout color could be just shade variation from…

ANSWER – Marble is made up mostly of calcium carbonate, which is a material that is sensitive to acid.  Lemon juice is acidic with a pH around 2; neutral is a pH of 7.   So…

ANSWER – There are many different types of stains, so the trick is to try to determine what caused the stain, because if you know that, then you have a chance at figuring out how…

ANSWER – There are many different types of stains, so the trick is to try to determine what caused the stain, because if you know that, then you have a chance at figuring out how…

ANSWER – I saw the photo.  I couldn’t zoom in to get a good look at the tile.  It looks to either be an unglazed porcelain or ceramic tile mosaic or it is a natural…