300 guitars told me how to clean a guitar or amplifier jack, and then showed me too in this neat little video:
And then a ferret showed me how to clean my pots using a special spray. It worked like magic on my guitar, so I took the back off my amp and did the same thing on all the pots in there too, and bingo! That annoying fluttering noise I used to get every time I twiddled its knobs has vanished.
Total outlay: €11, plus I learned stuff.
I am currently winning the game.