After spilling toilet bowl cleaner on the natural stone tile on my bathroom floor, the tiles were stained forever I had assumed. Two different tilers tried to repair the damage, one of them said that the tile would all have to be ripped up and replaced. But Christian was able to restore the tile and you would never know that I cant be trusted with toilet bowl cleaner. In addition one quartz and one Corian countertop and sink were buffed to brand new condition, shower tile was cleaned, and mold at the bottom of a shower was eliminated. Good follow-up service too. Worth every penny.