R
rainsco
i know, you are a pci fan but take care if you ever use pci geofug on dark tiles. any kind of residuals can not removed by acid cleaners. especially you musn´t bring water for 7 days into the groat. in the aktuell "fliesen and platten" there is a report that says two or three change cleanings with acid and alkaline lotion is the key but i had a projekt there was not. i worked 9 hours in a bathroom to clean the tiles mechanicly with a epoxy pad by hand and scouring milk.