There are a number of products by various companies that will work as well as CRC 5-56. The secret is to look for "Electronic Cleaner," not "electrical cleaner" or "brake cleaner." Electronic cleaner is also sometimes called tv tuner cleaner. The brake cleaners are designed to wash down asbestos brakes and keep the asbestos in suspension for disposal as well as to wash the newer brake compositions with out putting a lot of dust in the air. Since there is no plastic involved in brakes, it won't be plastic compatible. Electrical cleaner is designed to clean electric motors and contacts, again, it is not plastic compatible. Electronic cleaners are designed to clean electronic circuit boards wqithout disolving the plastic. You can pick them up at Radio Shack (expensive), or any electronic supply house, also at any industrial hardware warehouse like Grainger, etc.
I forgot to mention that a good thing to use instead of baby wipes which will tend to be lubricated are those little alcohol wipes that you are given at the local barbeque restaraunt when you order ribs. Another source of the wipes is a medical supply, since that is what the nurse uses to wipe your shoulder off with when you get a shot. You could make a nice track cleaner by using a small wooden block with a dowel for a handle drilled and glued into it. Then use a couple of rubber bands to hold the wipe on the block. I don't know if those wipes are available in grocery stores or super markets, but if you have a restaraunt supply distributor in yoour area, you could check with them. The other source might be to talk with the owner or manager of a local restaraunt that uses those wipes and see if you could buy a case of them from him/her.