Two questions please ...

I have a Kenwood R-600 that sometimes goes a month or more
wihtout use and has a volume control and band switch that has
become too scratchy and tempermental to use. I have to wiggle
both back and forth to get a usable connection. Taking the
knob off of the front panel I see no place to inject tuner
cleaner unless it could be forced through the front bushing.
If possible I'd really like to avoid disassembling the radio
just to find a place to inject the cleaner. Anyone have
experience with this problem and a solution?

Second question, I hate to pay $6 to Radio Shack for tuner
cleaner that would be used 15 seconds total. Is there an
alternative?