Power washing can save your driveway from harmful growth If you do not keep your driveway clean, it can grow algae, mold, moss, mildew – all of which can result in the need for repairs. Pressure washers do such an exceptional job of truly cleaning every pore of the driveway that mold and mildew have no chance to grow.
Generally, you should be power washing your driveway and patio once a year, or if there isn't much dirt buildup, once every eighteen months. However, you shouldn't wait until your exterior gets really dirty.
Pressure washing is a great way to not only make sure the surface is clean, but it also can take off old, peeling layers of product that could cause the new applications some problems down the line.