I wouldn't use WD40 either. It leaves a deposit that will just accumulates more grime. The Nexxtech product mentioned earlier is very volatile, so it doesn't stay on as a sticky surface.
About opening the back of a pot every time you need to clean it, is the best way to eventually break those cheap white metal tabs and ruin the pot in doing so. No need to, since Nexxtech will penetrate to the contact surfaces, through tiny openings in the pot construction, and flush out dirt. I've always done it that way, with some liquid being sprayed around the pot area. It dries almost immediately, leaving nothing behind. I use it for the toggle too, maybe once a year. I never saw the need to replace the "cheap" Epiphone toggle switch in doing so.
At $9.99 a can on Amazon, it's a no brainer.