@ Soweto888: If it's definitely solid black plastic and not just a coating, try T-cut car polish. I've used this to restore UPVC window frames to bright white when washing wouldn't clean them.
@ChrisNW started
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@ Soweto888:
If it's definitely solid black plastic and not just a coating, try T-cut car polish. I've used this to restore UPVC window frames to bright white when washing wouldn't clean them.