Step 1:

Place any used ball in the echo/2XP.

A ball that is still warm from recent play is best.

Step 2:

If ball is really old, add just a drop of water to the inside of the top cap. 

Step 3:

Place cap over ball and gently twist back and forth. Don't push too hard, just gently remove surface grime, not rubber. Flip ball over to evenly buff the entire ball.

Step 4:

Finished ball will feel tacky and ready for use. A typical ball can be rebuffed at least 5-10 times. Eventually the ball will break while playing, however it can repeatedly be buffed between games until it breaks.