Brake fluid is kinda of scary, maybe a last resort? Other products I've seen work is WD-40 (works great on any thing sticky) and a commerical product made by PPG called DX330 Wax & Grease Remover. We use it for prepping panels before painting but I've seen it take off over-spray on rubber seals.

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jeffs
1999 CLK430
silver/charcoal