I recently bought the undercarriage cleaner to help clean oil from the underside of my car. It worked great for that. I didn’t realize that the angle of the nozzles can be changed and you can also use it as a surface cleaner. It works well to help remove moss from patios.
Just finished using this to clean under my Jeep Rubicon worked really good, it hooks to a presser washer and you just roll it back and forth under the vehicle.