Anyone care to give me any
tips on the best way to revitalise these old pots?

No way if these are sealed. They are probably carbon composition, which is
notorious for getting noisy with age. The trash container is where I would
deposit them. New ones are not that expensive, but I have used new ones that
are noisy.
Ham radio stuff, they might work after a fashion, but I would be very careful
using them in a critical circuit.
73 Gary N4AST