I've used the Simple Green/Rubbing Alcohol combo before. It works very well. I did it to my 508A and it brought that ball back to life. I use Simple Green a lot. It's my favorite cleaner. I clean my kitchen with it, my bathroom, my RC cars. That's why I had Simple Green in the first place, we clean the tires off our off road RC cars with it. Cleans the tires well, and gives them grip.
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