Merchant Response:Thank you for the great review! We do recommend removing the magnets and cleaning under them once in a while (weekly is best, but less often is OK too, unless you live in a desert where everything gets baked on). Also remember that direct sun will eventually cause color fading on your magnets if you car stays outdoors all day long. Car wash high pressure sprayers and brushes are known to occasionally keep car magnets as souvenirs. Best to remove before sending your car to the shower, or, just be sure to check before you leave the car wash. (If ever your magnet gets an attitude and is stubborn about coming off, warm it up a little, or even pour a little water with dishwashing liquid on it and you should win the battle, leaving the surface underneath just fine. We've sold over a million magnets and only heard of this happening a handful of times but we thought we'd mention it anyway).