I've had mine since May. Probably the rubber coating can be destroyed if you clean it too aggressively. Don't rub it with a cloth or an anti-static wipe. That

I've had mine since May. Probably the rubber coating can be destroyed if you clean it too aggressively. Don't rub it with a cloth or an anti-static wipe. That will just cause small fibers to stick to the tacky rubber. How to clean it: http://itecsoftware.com/how-to-clean-your-nexus-wireless-charger-like-new http://itecsoftware.com/how-to-clean-your-nexus-wireless-cha... In my case the charger sometimes sticks to the phone when I pick it up.