Worked excellent on the belt weatherstrips. You take 1 part wintergreen oil and 3 parts xylene. If the part is small enough, you can soak them in an enclosed container until soft. With an odd piece like the belt weatherstrip though, it was hard to do. So I heated up the rubber gently with a heat gun and spread the mixture with a brush. It will evaporate so you have to continually brush it on. Heat it up every so often and repeat. I couldn't believe the difference. It's soft, goes right back into shape, and shows no signs of age. You can do a search for it online as there are other methods that involve heating a water and oil mix but the heat gun works good too.
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