The best contact cleaners I have run into are the DeoxIT and PreservIT, formally called Cramolin Red and Blue, products from Caig Laboratories (www.caig.com). I use their R5 DeoxIT spray. It works great for contacts, pots and switches.
Can I connect speaker wire this way...?
I want to try a set of speaker wire that I have but it has bananna's on the amp end and the amp does not except them. For a trial period, can I remove the bananna plugs and use just bare wire and screw the binding post down on them? I would later add spades if I wanted to use them.