much liquid that is spilled in bathrooms, marble tends to etch pretty quickly. Still would seal it or have it sealed, but you won't have to stress about the etching!

Etching is a reaction to acid in your stone...it is just that, "etched". It needs to be buffed out, using industry specific products. Sometimes it is too deep to get out without sanding or buffing down too far...leaving a divot in your stone. This needs to be done by a professional. I want to stress that it is not a stain, so no amount of stain removing is going to fix it, since it is etched.

mildly acidic cleaner on a siliceous stone (granite). However...if you have a temporary sealer (like the one you described for us this weekend), it will eventually eat through it. When it is sealed with Granite Shield, there are chemical bonds that are formed at the surface of the stone...we will use a carbon crystal (not to be confused with crystallization that is harmful to the stone). This bond cannot be "eaten through" with ammonia or vinegar. For now, I would stay away from vinegar and ammonia, simply because it will potentially eat through the sealer and leave the stone unprotected. It won't harm the stone, but acids also prime many materials for absorption. If anyone reading this has marble...our advice is different. Marble (not granite), contains calcite (Calcareous). It will etch when it comes in contact with acids. Hope this helps!! Enjoy your stone!