I have an 89 Formula that the vinyl was starting to look a little worn on. I used this stuff called Starbrite Vinyl Cleaner and Restorer. It did a great job of getting the dirt out of the cracks and shining things up. If you put an application on every time you go out it really keeps the vinyl soft. You can buy it anywhere, West Marine and even Walmart I think. Try to avoid using armor all and things like that because it breaks down the stitching in vinyl and dries the vinyl out making it crack. Good luck!