I have had my C5 convertible for about six months now and it has finally occured to me that I might need to provide additional care to the fabric top. Does anyone have tips or suggestions for proper care of the fabric top? I've read up on some products by RAGG, I think is the name of the product. This is about the only product I've found available. I am open for suggestions and am looking to do the right thing in taking care of my top.