How do I erase magnetic swipe cards?
Strong MagnetSwipe the card that has the magnetic strip you wish to erase along the magnet that holds your refrigerator door closed. Be sure the magnetic strip faces the magnet to ensure the card is erased. Just about any magnet at least as strong as the refrigerator door magnet will do the trick.Improper StorageCarry the card unprotected with your keys or other metal objects. This may demagnetize the card stripe. In addition, placing credit cards back to back causes the magnetic strips to interact with each other, potentially erasing one or both cards. Leaving the card in clothing and allowing it to be laundered can also destroy the stripe.Electronic DevicesBring the card in close contact with an electronic device such as a cell phone or computer for long periods of time. This may also erase the magnetic stripe.References:How Magnets Can Ruin Credit CardsMaybank: Card Care Tips”Physics for Scientists and Engineers with Modern Physics”; Raymond A. Serway and John W.
