Contact cleaner is probably a good idea though I never used it because I've seen contact cleaner degrade some kinds of plastic, probably would have helped a lot when working on sets folks have smoked around. All that greasy crap from cigarettes coats everything and the dust has a party in it.
Helping out is a good thing. IMHO you just have to be careful with advice on forums. There is a long history in the Amiga community of people with no electronics experience misunderstanding advice and toasting expensive hardware, so my first fear was someone putting a wet rag to an energized tube.
Us oldtimers remember thinsg like an AmigaOne user prying SMD chips off his board with a screw driver, or something along those lines. Voiding his warranty and toasting the $1000 board.
