Expert Answers in Stains

ANSWER - I am guessing that you had a through-body/unglazed porcelain tile since you said it was a matte finished porcelain tile and you said that the installers were able to grind the surface to…

ANSWER - Normally to remove a cementitious haze you use acid, but not just any acid as acid used wrong can cause etching problems.  Never use muriatic acid like what is added to pools.  Sulphamic…

ANSWER - Slate is a very dense stone, so I would not expect it to have a deep stain.  I would not expect the stripper to cause the white staining.  I would initially assume that…

ANSWER - Looking at the photo you attached, my best guess is that someone used a time capsule fertilizer containing ferrous sulfate near the pool and broadcasted it into the pool. I say that because the…

ANSWER - Porcelain tile is not known to fade.  It is not uncommon to find that the tile color under rugs that have been in place a long time are a different color or shade. …

Questions -  Most stones contain some ferrous oxide minerals that when subjected to excessive moisture can cause a rust-like stain.   For it to occur the stone has to be subjected to some level of moisture.…

ANSWER - I assume you must have an Ubatuba granite counter top. Many granite and other types of stone are treated at the processing plants with sealers or color enhancers or resins to stabilize or…

ANSWER - I have seen Carrara Marble installed in showers and steam shower successfully, but I have also seen where there were staining problems. Many marbles contain pyrite (iron sulfide) minerals which is a natural…

ANSWER -  Normally installing tile over damp mortar doesn't cause staining.  We call that a wet set method if the mortar is installed at the same time as the tile is installed.  A thin-set adhesive…

Answer - If you have subway tiles, I assume you are talking about tiles on the walls of the shower.  Although perhaps you did install the subway tiles on the shower floor. Most subway tiles…