Re: Pickup mix rotary switch (Alpha Taiwan)
I use a product from CAIG Labs - called Cramolin red and Cramolin blue.
The red cleans and de-oxidizes. The blue acts as a contact protectant.
These days the product is called De-Oxit.
https://caig.com/deoxit-d-series/#My version apparently causes cancer and was banned.
I've had the same bottles for over 40 years. (Excellent product)
I used it in the military for cleaning SEL 32/7X mainframe connections.