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CRC is fine for the liquid cleaning portion of the process, it's non residual and doesn't attack plastics, components or circuit boards. Regular 90% isopropyl alcohol is also a good start in most instances. Then there are combination type cleaning and lubricant sprays that will also work well...

IXNAY on the Emery board, much too coarse! A clean dollar bill would be a much better choice than an emery board. There are much better products to use to burnish/clean relay and switch contacts. Again, great job! and yes it is very rewarding to learn about and get good results trouble...

OUTSTANDING!!!! Thanks for the update and congrats on resolving your problem! What was the surface condition of the contacts that you viewed, were there any flash/burn marks or was it just improper orientation of the knob gear? Good work.

I'd try switch disassembly, what do you have to lose? If nothing else it will give you an idea of its construction and you might be able to clean up and burnish the offending contact inside. I'd do it on a clean white towel and lay the parts out as you take it apart. Maybe even have a video...

I just went through this same situation. Check your PMs Both my S6 and S8 were gritty and M1 not reading. Cleaning the switches solved the problem with mine.