I agree with Matt. I have a number of old cameras - dating back to 1030 - and have never had any of them cleaned or adjusted. They all work fine, and that includes sixty year old selenium light meters. People can lead you to worry too much about photographic kit.
The CANON 'A' series are very prone to the famous ' Canon Squeak' if you do not exercise them -- I have an A1 given to me with the squeak as it had not been used for 7 years since the owner died and I have been trying to lubricate it as I read on some forums but not with any success at the moment. I have several Weston Master V meters and some just given recently -- not working as the cells are probably gone with age.