I have a white top and the best stuuf that I have found out there is 303 Aerospace Protectant. It works great on my white seats and on the dash pad too. If the gloss is too high for you when you apply it, just mix 1:1 with water to cut the shine. You can probably still request a sample on their website, if you would like to try it before you buy it. My local ACE Hardware sells it, but it's kinda pricy.