i used geeration 2000 contact cleaner-non-residual- from radio shack--i got a large can for 12 bux-- i went meticulously over every thing on the hifi-contacts--binding posts--plugs--power strip(turned off-of course) ect; well!!! cleaner-clearer and a more solid precise bass!! just like a thin blanket had been removed from the speakers-an exellent improvement-i'm well happy with this
