If you would like to save the trip to the hardware store pick a piece of smooth cotton cloth add a little tooth paste and polish your AC plugs shiny don't leave solid residue by cleaning thoroughly with a damp piece cloth and use at least electronic contact cleaner swabed with a lint free cloth. Cones under your source components *i.e. CD player* if you look for the right spot might provide in certain cases better treble definition depending on the unit but worth a try
smoothing those sibilants...
I appreciate the feedback on the interconnect post I made a few days ago, and here is my next question: If I am attempting to smooth out the sound of a "low-end-of-the-high-end" system, reducing grain while retaining detail (and looking for a warmer more "classic tube sound"), where is my energy/$$$ best spent? Would it be the digital source itself, the interconnects, the input tubes, the speaker cables, or the speakers? Or something else? (System info can be seen under the post entitled "need interconnect advice", and there are some new interconnects on the way.)