I got this MAXX surface cleaner tool last fall and didn't get a chance to use it until this week.
It works with your power washer (max 4500psi) and the wand/nozzles rotate in a circular motion. Push or pull it on three wheels.
This tool has a quick connect and attaches to the wand on your power washer. It makes power washing the grime off the concrete driveway a lot easier than just using the wand and spray nozzle. It was also easy to switch between the surface cleaner to the fan nozzle.
Before and after images of just one section of driveway.
My electric power washer only puts out 1700 psi. Although my setup worked good, I'm sure that more power washer that puts out more psi would have even made it better and probably faster.
I have ±4170 sq.ft. of combined concrete surface (driveway, porches, patio, and sidewalks) to clean and I went over it twice, washing in two different directions. Total of about 10 hrs.
A short YouTube video and no guest stars of how I used it.