We just purchased our first Bennington 20SL (Brand New) and we are noticing the vinyl stains very quickly. We cover the boat all week long and on the weekend, we will cover it immediately if it is going to rain or if bad weather is in the area. We have stains on our vinyl already from air born stuff like a leaf or bug or twig etc. The stains are deep in the vinyl already and we don't know how or if we can get them out. We tried a few spots with some typical vinyl cleaner but nothing gets removed. Any thoughts/comments would be appreciated.