If you're thinking about hiring a pressure washing company or even buying a pressure washer of your own this might help you out. You must first determine, what are you trying to clean?
If you are trying to clean a driveway, patio or any other concrete surface then you will be best off using a pressure wash with some proper cleaning solutions to bring out most of the tough stains.
On the other hand if you are cleaning a surface such as your siding, roof, or any other more delicate surafce then pressure washing may not be the best option. Instead we recommended soft washing.
Soft washing is great for cleaning almost any exterior surface to an almost brand new state.