I use Armor All like I do on the door handles. Some people swear by peanut oil and there are other Back to Black chemicals out there. Start trying things and it's a personal preferance I guess.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K