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General rule of thumb on something that old is to use regular deoxit or other contact cleaner on metal/metal pots, and something with a lubricant in it like deoxit fader lube on anything that has a carbon trace inside of it.
Really old carbon traces can be brittle and spraying them with harsh solvents can cause them to crack off. Fader lube type products are designed to help restore some of the durability to carbon tracks. It doesn't always work if the tracks are too far gone, but it can prevent catastrophic failure of a carbon track that is starting to get crunchy
I don't know what's inside your pots though.
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