Pressure washing uses high pressure with low volumes of water.  It is a good method for certain applications that require stripping away layers such as stripping a wooden deck in preparation for staining or stripping away loose paint in preparation for painting.  It is also a good method when used in connection with a surface cleaner which can be likened to the rotating wand in your dishwasher.  It disperses pressure evenly while spinning to more effectively clean surfaces like concrete driveways or sidewalks.  However pressure washing can be volatile if used as a method on sensitive applic