squelch knob

So i just purchased a BCD536HP for $112 bucks i know a crazy deal i can't believe it either. but it has one small problem the squelch knob has a crack in it other than that it works perfect. i have googled around and tried to find a replacement but i can't seem to find any. i emailed Uniden but...

I have recently started to have issues with my pro 106 volume squelch knob. It seems to stick together when trying to adjust ether the volume or the squelch. it only after about 11:00 position on the knob, is there a way to safely clean it so I can prevent it locking up or having to send it in...