I tried this today to clean a concrete parking pad that hadn't been cleaned in 12 years. I was using a Black Max pressure washer rated at 2700 psi and 2.3 gpm. I noticed striping, the washer wasn't cleaning well in the middle of the path. I checked the nozzle and one was plugged. That's the main reason I'm giving this 4 stars instead of 5. That should have been caught during manufacture. Once I fixed that, it worked better. You have to go pretty slowly but it's better than using a spray nozzle, even if you have to go over some of it again. It's very light and manueverable. We'll see how it stands up to extended use.
Surface cleaner seems well built. Last surface cleaner i bought broke with about five uses. This cleaner looks like it has better parts than the last one i purchased from a different manufacturer.