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Try gel but even after buffing off it still tends to run down the paint after rain etc. I personally use Clearkote Vanilla Moose Hand Glaze, brings them up like new.
Zymol Carbon exels at this task, but buying it just for plastic/rubber dressing is clearly not going to happen! Other options that work well; leave bare after degreasing, or 303 Aerospace Protectant. Blackfire Long Lasting Tyre Gel also works a treat on window rubbers.
i was going to say either the ag bumper restorer or the 303 aerospace are great. if you use the 303 though spray onto a cloth first otherwise you'll end up having to clean it off the glass and paint. it's not as oily as the ag stuff too, which i personally prefer.