HG patio cleaner is a strong concentrated cleaner that was developed especially for cleaning dirty, dull gravel and concrete tiles. Wet the tiles first, do not forget the grout and wipe up any puddles. Mix HG patio cleaner with 4L of water in a container that fits a stiff broom, in a washing-up bucket for example. Dunk the broom in the bucket and apply the liquid whilst scrubbing. Leave it to work for a few minutes. Then scrub again and rinse the tiles with plenty of water before the liquid dries out. Next you could use HG patio tile renewer. With this powerful and self-acting product, your tiles regain their sparkling original colours and look like new again.