The use of paving stones to create roads dates back to Roman times. Romans built roads covering approximately 62,000 miles using an intricate method of layering specific sizes and types of stone. Today, paving stones are used for walkways, driveways and patio construction. While you can effectively wash away much of the material that causes stains with a pressure washer, there will be instances in which you need stronger chemicals to accomplish the task.
Cleaning Bark, Leaves, Algae and Food Stains
Mix 1 part bleach with 4 parts water in a bucket. Swish it around to mix.
Dip a shop broom into the bucket, then scrub the dirty pavers with the solution.
Rinse the bleach and debris from the pavers with a garden hose.
Cleaning Stubborn Markings
Wet the pavers with the garden hose. Apply phosphoric acid cleaner, according to manufacturer's directions, to a 4- to 5-square-foot section of paver.
Scrub the acid-covered section thoroughly with the shop broom before rinsing immediately with fresh water.
Apply and scrub the phosphoric acid cleaner onto remaining sections of pavers, rinsing each section as you go.