I have an early 70s receiver that needs some maintenance. The switches and pots have become scratchy again.
It's the second time that I'll be servicing it. The first time I did a full check, and fixed the lights. This time it's just a clean-and-lube of the dials and push buttons.
The funny part is that a can of either product costs more than what I paid for the receiver 
Work done. The cans arrived:
Cleaner left, lubricant right. I was able to reach all gizmos after removing the bottom plate. The tone controls weren't easy. They sit on a PCB and not a lot wiggle room to poke inside. All others are either exposed, or have an easy vector of attack.
Before putting all back on its place, I ran a smoke test, and the result is good. Cracks and finicky contacts are resolved. I took advantage of having the shelves away from the wall, to tidy up cabling. All good for another 10 years.
