I have used this three times. It dries my car well. After each use I have stored it damp and rolled up in the tube, as per the manufacturer's directions. Last Saturday I got it out of the tube and it has little pink spots all over it. I think it is some kind of mold. I used it anyway and it still dries well, but I don't like handleing mold or rubbing mold on my car. I think I will go back to towels.