I used Meguiars Ultimate Black on mine and they came up nicely, but you need to reapply it every few months or so depending on weather/use. I repaired the indicator/fog lamp bumper surrounds and therefore painted those in satin black and they still look good a year or so later... Not sure if the material is identical to the bumper itself though.
Some people swear by using a heat gun to bring up the original colour but personally I wouldn't as I think it's likely to degrade the plastic more quickly.
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