On my old E36 I used a silicone spray to good effect. To avoid making a mess (ooh er etc) I sprayed a cloth and rubbed it in. Was about to do the same on my E92 (doesn't really need it but I thought best keep it supple) but then by chance I read the 'Looking after your car' booklet that came with the car and it says don't do anything. Odd.
sim
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