There's pros and cons to pressure washing. With some units they will destroy electrical connectors and you won't even know it. Others have literally removed the paint. Heck the pressure washer I have you can write your name in concrete with it.
Perhaps just those sweeper nozzels.
Brass Sweeper Nozzle # GT-1015 by Mintcraft http://lawn-and-garden.hardwarestore...s--611016.aspx