Cleaning the pots just extends their usable life and it is a way of maintaining your instrument (like cleaning it, changing strings, setups...)
Pots normally have an "x" amount of turns until they start failing unless they are being abused or stored in bad conditions (damp, dust, etc...) which will make them go "caput" even sooner.
I normally use Servisol and if a pot is giving serious issues, I whack a new quality replacement in.
I am tempted to use the bike chains method though... LOLOL