As a inexpensive cleaner to use and keep in your bag you can use simple green. The stuff the proshop guy has is better though, Track's Clean n Dull, neo tac's hook-it are just a couple. They get the ball much cleaner than simple green will.
When you get a ball polished and have thrown it awhile the polish in your track area eventually starts to wear off. The only true way to get it back to where it was is to take it to the pro shop guy and have him use the same polish on that he did before.
goodluck
