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.com