RainX instructions say do not use it on plastic unless approved by the manufacturer. Searching the forums, I see that at least one user has used it on the clear roof. Has anyone else had success with that? How about other plastic parts like the headlamps? Thanks!

I have a set of Rain-X Lattitude wiper blades on another car. I really love them. The Rain-X site, Rain-X Wiper Blade Selector Guide has an easy selector guide that allows me to order Rain-X Lattitude blades for a specific car. However, the smart is not listed on the Rain-X selector guide...