I bought it for washing the underside of my car as the roads have been getting salted this winter. It works just fine for that. I tried it out on a section of concrete for washing the dark mildew or whatever it is that stains the concrete every winter and it works ok for that too. I worry that I am going to break the extensions if I hit it on anything too hard and wish it felt a bit sturdier but for the price and saving me from having to go to the car wash to rinse the undercarriage it is worth it even if it doesn't last very long.
This product works great when cleaning my pool deck. Leaves no streaks or lines. Wish I would have found this device years ago. The Westinghouse Foam Blaster and this device make a great pair.