There is a product called 303 Aerospace Protectant. Since to come recommended by a few folk. I use it and like how it does not shine the dash like Armorall does. And I just dont care for Armorall anyway although I think it gets a bad rap.

This stuff is not cheap. But I think its the best product possible.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car