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I use some Meguiars stuff, Tyre Shine I think, it doesn't give the initial blinding shine that many others do but seems to keep them fairly black for much longer than anything else I've tried.
I would concentarte on your prep to achieve longetivity. Ensure the surface you apply to is 100% CLEAN as applying a dresing to mud/dirt will reduce its longetivity.
Try cleaning wheels with a TFR, APC and tyre brush and then dress with megs #38, megs endurance etc