Also grab a wire brushpreferably a wider wire brush like one of the ones thats 3 wide not a 1 inch wide one. For about four gallons of water in the bucket use slightly less than a. Pin On Art Patio Pavers Design Patio Stones Backyard Patio Mix up the flagstone cleaning solution. How to clean flagstone patio . Spray undiluted white vinegar directly on the stained or molded patch and scrub it a little with a hard-bristle brush. Sweep your flagstone regularly with a dry broom or dust mop to. Before cleaning your flagstone remove all dust and debris. One cup of bleach in a gallon of water is a good mix. How to clean dry laid flagstone with a scrub brush Get out your scrub brush and put on some knee pads. How to Clean Flagstone With Vinegar Remove Dry Debris. The second option is to use a product called Bio Wash. Let it sit for about 15 minutes and then rinse with water. How to Care for Clean Flagstones. Apply the mix with a tank sprayer avoiding overspray. Le...