That looks really nasty-has anyone checked the moisture-First you need to find out what is going on here.Looks to me like its below the surface-whatever it is.Give us some background on when this started occurring.That looks like a Damp staining issue. I don't think it is mold or mildew.Using more water based chemicals may not be the answer until you find out whats happening under the stone.If the client has extra tile you may want to lift one and see whats underneath.On Mon, Oct 30, 2017 at 3:31 PM, "marblerenu@aol.com" (via sccpartners list) <nobody@simplelists.com> wrote:M3 Tech - talk to Bob Murrell.------ Original message------From: Anthony GodoyWe did use Klenzstone and it's not working. Where can we find Tio2?On Oct 30, 2017 3:22 PM, "marblerenu@aol.com" <marblerenu@aol.com> wrote:Hi all;Have you tried Klenztone #4 or Ti02? Use it with a spinner tool.------ Original message------From: Anthony GodoyDate: Mon, Oct 30, 2017 2:08 P MCc:Subject:Mold on stoneHi partners,We have used several stone cleaners as well as chlorine on this stone. Nothing seems to be working on this. Does anyone have a suggestion what we can use to remove this?Thank youVisit list archives, subscribe, unsubscribe or change your subscription preferences: http://stoneandtilepros.simplelists.com/sccpartners Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.comVisit list archives, subscribe, unsubscribe or change your subscription preferences: http://stoneandtilepros.simplelists.com/sccpartners Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.com--Visit list archives, subscribe, unsubscribe or change your subscription preferences: http://stoneandtilepros.simplelists.com/sccpartners Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.com