Use Deoxit process. Couldn't discern any audible difference over the few weeks following. But it did make sense to clean and protect the Cu connection at my spade. That was sense enough to me.
Are contact treatments worth the money?
I have been reading some of the claims regarding the benefits of applying contact paste, liquids, etc. to all my connections. It sounds appealing but would like to know your experience with such products. Prices range from $35 to hundreds.