get it through your BMW parts department. it's like chapstick for cars.
I just treated my car a few weeks ago. at the same time, I treated the dash and other plastic parts with 303 aerospace and treated teh cow with lexol cleaner and conditioner.
it leaves a high gloss if you put too much on. I applied it using the built in applicator then followed up with paper towel to pick up the excess and to spread it more evenly. after that, the seals looked new (deeper black and matte versus glossy).
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