One of my amps has been making some intermittent crackling noises here and there when I play. After doing some reading online, it seems a good first thing to try is using aerosol contact cleaner to clean tube pins, tube sockets, pots, and even input jacks (yes?)... I've used contact cleaner to spray inside a noisy volume/tone pot on an electric guitar before, and I've also sprayed it on tube pins before putting new tubes in an amp... If I want to do a thorough cleaning of these contacts in the amp, what are my limitations? - Can I spray it directly into the tube sockets as well as the tube pins, work the tubes in and out, to clean all those contacts? - Can I spray it inside all the pots on my control panel the same way I would spray it in a noisy guitar pot? - Can I spray it into the input jacks and speaker jacks and work a 1/4" plug in and out a few times to clean those out? Any other suggestions or cautions? Thanks!