I did a test once, using Wheel Wax on half of the wheel, and nothing on the other half. To my surprise, the Wheel Wax side collected more brake dust than the unwaxed side. A half-to-half comparison should be pretty accurate, vs. a wheel to wheel.

I tried Zaino on one wheel and it seemed to help, but it wasn't a direct half-to-half comparison, so it's not a definitive test.

I may try it again this Spring and see what happens. May I'll try three wheels -- Wheel Wax vs. Nothing, Zaino vs. Nothing, and Wheel Wx vs. Zaino.