HG patio tile cleaner is a strong concentrated detergent, developed specifically for cleaning stone slabs, concrete and clinker dirty or greying country. Wet abundantly the tiles and don't forget especially the joints. Remove excess water with the broom. Mix the contents of the vial with four gallons of water in a bowl large enough to insert a large brush (for example, a wash basin). Dip the brush into the jar and apply liquid rubbing. Leave the product for a few minutes. Then rub again, and rinse with plenty of water before the tile has dried liquid.