Russ Andrews Microfibre Cloth
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Wipe clean CD players, dvd players, amplifiers, iPods and other mp3 players, games consoles and set-top boxes. Even use it on digital cameras and mobile phones.
It's also extremely useful to use in conjunction with DeoxIT electrical contact cleaners. You can either apply the cleaning solution direct to the cloth or wipe around the contact or apply the fluid directly to the metal and use this cloth to wipe off excess fluid.