This surface cleaner does the job. I had purchased another model that was just ok. I research and purchased this make and model. So far so good. My sidewalks look great. It was easy to use.
It worked pretty fast to clean off the surface of the cement in front of my garage, but it still looks darker than the rest. It will probably take some kind of heavy duty cleaner to remove the stains. I was hoping for more. Sometimes it just takes elbow grease.