Window Trim spotting

Anyone know what to do with the spotting that occurs on the exterior window rubber (the bottom horizontal piece that are between the bottom of glass and top of door)? I live in sunny Florida, and it is wreaking havok on these pieces of window trim on my 04 Double Cab PreRunner. I have tried Mothers Back to Black, and although this stuff does an incredible job on my fender flares, black mirrors, and front lower facia, it does nothing to help the spotting on these window molding pieces. HELP!

 

you may need to get some 303 aerospace protectant. i believe you can probably pick some up at a local boat/marine service place. also, i think you could probably try a little baking soda and water to clean it first. let us know how it turns out.