I bought one of the kimberly clark magic outdoor covers back about 94 or so as the car was parked outside. The cover always had a strange dirty feel to it. Washed it several times at a laundromat per instructions and air dried. It did its job but was prone to tearing at the antenna hole.

My other cover that was purchased in about 83 is 100% cotton and still hanging in there. Don't think I'll ever buy anything but a cotton cover again