No matter what kind of plug, a long time without use will make the surface oxidation, resulting in poor contact. Therefore, it should be protected if not used for a long time. Many audio I/O devices come with a plug sleeve when purchased, and that is the best protection. If the 3.5 Audio Plug has oxidized, the following methods can be used (the above method is best, the following method is worst)
1, with dilute hydrochloric acid, can be very loose, use paper cups filled a glass of water, with a glass rod with concentrated hydrochloric acid, thrown into the water, be careful when you operation, don't jilt all over the world, and be sure to stay away from strong hydrochloric acid bottle), left a few times more, then the entire plug bubble inside, stir in the long run that's all right, because silver and copper and not reaction of hydrochloric acid, and then take it out to dry
2, with toothpaste gently wipe, gently wipe, wipe more. Force may scratch the coating, scratch will also be bad contact
3, with cardboard wipe, do not follow the grain, but also gently wipe
4, use eraser, this should be hard, but not very good to wipe, some places may not wipe
5, sandpaper, fine sandpaper better, coarse sandpaper is dead, it is best not to use this method.
Wushuang introduced these several maintenance 3.5 Audio Plug methods, very useful, you can try.
