The tiler didn't take any notice of the installation sheet I gave him regarding grout colour. He chose black grout because it looks best. It does look good, and he has laid the tiles well, but when he had finished he told us to wait a couple days until the grout dried, then clean. We tried everything to clean them, but they still looked dirty. As a last resort, my husband cleaned them one by one with hydrochloride acid, immediately rinsing off. They are now clean, but not as smooth as they were. We have sealed them, but they still feel chalky. Will they go smooth over time. My husband is searching the internet for a product to go over the top, to make them feel nicer.