To clean pavements, first spray them using a pressure washer. Avoid using small nozzles on the washer, as they may damage the surface of the pavement. Use a fan spray together with hot water instead. Coat the pavement with the pavement cleaner, and leave it for five minutes. Scrub the pavement one area at a time until all the dirt has been removed, and rinse the cleaner off.
For best results, clean the pavement regularly using a garden hose with a spray attachment. Doing this prevents the dirt from settling in the stone to the point that it can't be cleaned.
When using a pressure washer, some sand may be washed off. In this case, sweep the pavement using a broom, and add extra sand, if needed.
Before applying the pavement cleaner to the pavement, use it on a small part of the pavement to make sure that the pavement cleaner doesn't damage the stone. For stains such as blood, ketchup and cooking grease, try coating the stain with dish soap, leaving it on for 30 minutes and washing it off with warm water.
If several paving stones are very dirty, it might be easier to replace them than to try to clean them. Seal the paving stones using special products to keep them from becoming dirty again.