Most Mercedes SLK owners, myself included, swear by a product called Gummi Pflege. It's a liquid with a sponge applicator built-in, which you apply to all rubber seals. Keeps the rubber flexible and nourished and reduces all the creaks and groans.
Check Amazon, Ebay etc ("Mick's Garage" is one source). Probably a lot cheaper than a manufacturer branded product (which has probably been made by someone else anyway).
Also check Lexus owners forums for advice.
Edited by 72 dudes on 02/10/2016 at 23:51
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