Hello im a tile setter and had a quick question about a floor i set about six months ago. It's 24" slate tiles and its in a kitchen . My question being cleaning grease and oil spots out of the stone , the tile was sealed with pourse plus sealer 3 times ,but the stone still stained. i was gonna try T S P cleaner or a miraclean .also my coustomer would like the stone to look enhanced i was concedering a product called mira matte.if you can help i would be greatful thank you