I guess I could maybe imagine paying for that once every other year. But I think people underestimate how damaging pressure washers can be. Lots of folks have torn up their decks thinking they’ve “cleaned” them. People spray pressure washers UP at their house’s siding despite the fact that it is specifically lapped to repel water that is falling DOWN. And while concrete can stand up to a pressure washing, it will begin to develop any cracks you have if you do it frequently.