A simple "automotive" dielectric grease (around $3) from any autosupply store also is helpful in improving your sound.
And although they say it is "dielectric" I have a feeling that the conduction capabiilties are not that good....
The word "dielectric" MEANS that it does not conduct electricity. It is the wrong product. Dielectric grease is to lube electrical parts that you do not want to conduct. To the extend that any electricity passes through dielectric grease is where the grease is pushed away for a metal to metal contact. The use of dielectric grease is for things like the rubber boot on sparkplugs and similar things where you want them lubed but do not want a short.
There are electrical conductivity improvers and chemical contact cleaners in the hardware store...Ox-Gard is one. It works great on power terminals, like where your circuit breakers snap on to the lugs in the power panel and on the wire in the breaker connections and in the receptacle connections. Be very judicious in the usage...it conducts, so you don't want a bridge of this stuff across an insulator.
