I recently began backwashing my filter but the backwash valve was stuck and would not budge. My only choice was to soak the valve with WD-40. The next day, the valve was operational. I took it apart and cleaned it as best I could. Once the cleaned filter was up and running, I had an oil film (WD-40) on the pool surface despite my cleaning effort. I used these scumbugs and some of the balls in hopes of removing the film. After a couple of days with washing the sponges, the film had disappeared. I also added some pool enzyme treatment. These definitely helped clear the oil film.
Rating: [5 of 5 Stars!]