One of my commercial custys had their drains cleaned out over the christmas period and they have spilt some drain cleaner on their marble flooring in the toilets (not sure which but presume it was ind strength and contains sulphuric acid). Going to have a look tonight to how bad it is, if it's not etched to badly into the marble will i get away with renew polishing cream or will it require grinding. Will add some pics later.
Cheers Mark.