Echolane, +1 for moving the switches regularly to keep them working well.
I help maintain a studio mixing console with hundreds of mechanical switches. The advice given in the service manual is to do just that, operate them regularly to keep tarnishing to a minimum. Some of the switches are so stubbornly tarnished though that I have to disassemble the switch and scrape the delicate contacts clean manually. That’s from years of not moving them enough previously.
I help maintain a studio mixing console with hundreds of mechanical switches. The advice given in the service manual is to do just that, operate them regularly to keep tarnishing to a minimum. Some of the switches are so stubbornly tarnished though that I have to disassemble the switch and scrape the delicate contacts clean manually. That’s from years of not moving them enough previously.