The rubber treatments like Back to Black, Zaino tire treatment, 303, and Armor All are all just oils that can help to keep rubber and soft plastic pliable, but they don't keep them dark for too long and they don't do much for hard plastic parts because they wash off pretty fast. Forever Black is an actual dye that will last significantly longer. It will fade eventually too, but for hard plastics, dye is the best way to go.
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