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For a Christmas present, my wife bought me a "pro-sumer" grade pressure washer (Dewalt 4000psi/3.5 gpm rig). I bought a 16" BE surface cleaner to go with it. I am looking for advice to get rid of the racing stripes the surface cleaner leaves behind. I did not use any chemicals on this first try. A friend of my suggested using pool chlorine/water at a 50/50 mix with a cup of Dawn detergent before washing. Any tips from the pros to eliminate the stripes? Am I going too fast with the surface cleaner? This is central Florida, black algae and grime is what most driveways get dirty with. Mine is broomed concrete. The first 2 pics are before. The last one is after my feeble attempt. Thanks, Dave