A good torture test of staining is 'pickled beet juice' or any berry juice. We've had both on the quartz for some period & they have never left a mark. One day I saw a sizeable dry blue mark & determined that it came from the dye of a blue document folder that had been put on some water on the island top. Came off no problem. Often coffee or tea spills sit overnight. There is just no penetrating that I've ever seen.
Our installers left us a bottle of 'Supreme Surface - Granite & Quartz Cleaner & Conditioner' that 'Cleans, Polishes & Protects'.
My wife uses it very occasionally. The 8.5 Oz spray bottle looks to be about 90% full after 2+ years...
TAM
