[header] How to dispose of a credit card [title] Demagnetise the magnetic strip. [step] To safely dispose of an old card you need to first disable the magnetic strip which contains all of your personal data, such as your account number, card limit, and name. You need to demagnetize this strip to help make the card unusable by anybody. 
You can do this by running a magnet all the way along the strip. [substeps] Do this slowly so that the magnet is against the strip for a good amount of time.