Taking proper care of your car door magnet ensures you will get the most value from it.

Remove weekly for cleaning. Some climates or conditions require daily cleaning.
Clean both the magnet and the metal car surface with a mild detergent and wipe with a soft cloth or allow to air dry.
Remove your magnet during excessive heat and sunshine, and during extreme cold.
When not in use, store your magnet at room temperature in a dry, flat, & clean place. Do not stack other objects or magnets on top of your car magnet.
Do not use when it appears damaged, i.e. has bubbles, wrinkles or bent corners.

To avoid losing your car door magnet: