CL I had that same blue 20", but its going to go out on you. Were we doing a association were we cleaned all 52 roofs and then were doing the driveways. I was doing all the applying and ground guy handled the bushes for the roof cleanings. After we were done we started on the driveways, I got tired of just standing around waiting for him so I drove from sarasota to ft. myers NT to pick up another machine and surface cleaner. They were sold out of the GP surface cleaner so I bought the blue one, the top blue plastic broke before I was finished with the development and started going down hill from there. I think it lasted a month! Its still sitting in my garage lol