If you're asking what's the best way to clean electronic components like a game controller, unplug the device and clean it with alcohol. Wipe some on with a damp towel then wipe it off with a dry one. It's better to do it multiple times with a damp towel than to soak it. Be especially careful about applying too much alcohol on decals. If they get soaked, they may come off.
Wait about a half an hour before turning it back on to make sure all of the alcohol has dried..