Part of the problem is probably the RO. It will not do what a
PC will and you will see much better results when you upgrade. About the sticky button I don't know that I would use like an electrical contact cleaner. It will get rid of the stickyness but I've seen it melt plastic with a quickness. A guy at work used some on a sticky keypad for a phone and it destroyed that keypad. A citrus based
APC would probably take care of the stickyness and be much safer.