As MI Roadster stated keepng your car in the garage is the best solution. If you wash your car dry the top with a drying towel (try not to use a terry cloth towel, it will leave lint on the top). If you get caught in the rain dry your top if at all possible, the water that is left on the top will attract dirt and dust. Also acid rain causes concern, here in NY we have very bad acid rain. The DChrysler product is somewhat basically the same as the 303 products. The 303 products are a little bit cheaper and is readily available. I have used the Dchrysler products on my Sebring convertible, but it had to be ordered, usually took about 2 weeks for them to get it in.