I have used Armor All on my vinyl top for over 20 years. It does not fade nor harm the top. This is a replacement top from Legendary. What I typically do is wipe the top down with a heavy coat of Armor All, then I wash the car with a typical car wash soap. This removes the excess product, but leaves a nice clean, not overly shiny top. The 303 Aerospace protectant seems to be good too but its pricey, so I went back to Armor All.

This works well for me in the Chicago/Midwest summer sun. Those that are in the Southern half of the country where you get more sun, may have different experiences.