The highly acclaimed Contact-Z is an incredibly effective electrical contact cleaner, which should be used to clean all the plugs and sockets in your Hi-Fi system. Everything will benefit (even down to the speaker terminals), and we have found incredible sound quality improvements are to be had following cleaning of very low-level signal connections, such as Cartridge pins and Turntable phono plugs. CD Players sound better & A/V systems in particular benefit both in sound and picture quality.