Driveway Cleaner for Block Paving. Best Concrete Driveway CleanerBest driveway cleaner for Block Paving, Concrete and Natural Stone Driveways. A powerful Black Spot remover for driveways. *Not recommended for use on Tarmac*DriveClean Xtreme is a fast acting, high performance cleaning product. DriveClean Xtreme offers the easy way to keep block paving or any other hard surface driveway clean without intense pressure washing. Simply dilute 1:1 and apply to a wet surface by watering can or sprayer, Ensure that surface remains wet for 60 minute period, then rinse away with clean water. For areas of heavy contamination or soiling, leave product on surface for longer or re-apply.