This is magic stuff!
We have been using this in our workshop for over 30 years, (Doesn't time fly?)
If you have got a noisy microphone switch, or a crackly volume control, a quick squirt of this will usually sort it out.
As well a cleaning the contacts, Servisol also lubricates them and helps keep out moisture, Hundreds of uses. I have used this on door locks. ignition switches. hinges etc etc.
Servisol Super 10 comes in a handy 200ml aerosol.