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10 parts water 1 part simple green And a brush will work wonders on that color. Then either air dry or vacuum dryI’d be hesitant to use anything harsh on the seat belts, especially the airbag ones. I’d probably start as gentle as possible and see how that goes. I’d mix up a warm water solution with some regular laundry detergent or dish soap and a high quality microfiber cloth to dip in the solution and scrub the belt. Once clean, “rinse” out the soapy solution with a clean cloth dipped in fresh water.