Melvin-
They are used exactly the same way as wet/dry sandpaper. If you have a spinner, just make sure the pad is wet and apply light pressure to the ball. If you don't, then just use them while the ball is in a bucket or sink. Go in circular motions using light pressure, making sure to do the entire ball as evenly as possible. Your Mutant would be fine. Scotchbrite is actually preferred to sandpaper for particle balls. I hope this helps some.
Don