I just bought a used bike with front and rear air shocks. I think the rear is Cane Creek, not sure about the front. They both seem to hold air well, but I know nothing about them. How should they be lubed/maintained? I washed the bike - do I need to put grease on the exposed portion of the piston? What kind? Any/all tips would be appreciated. I'd rather take care of it than ignore it 'til it breaks.

Thanks,
Mike.