Here is my take:
Products like Poorboys Wheel Sealant + Smart Rim wax seem to reduce the build up of brake dust and mostly just act as a barrier to stop it bonding with the wheel.
Eventually they do give up and the longer its been on there the more prone to failure it is so every month you need restort back to some kind of cleaner on the wheels and then reapply.
I have been using AG Super Resin Polish topped with EGP, seems to last nearer 10 weeks is way, way more resistant then the two wheel waxes mentioned above.
I always use Meguiars UQD now as well, it seems like there is less dust and what does end up on the wheel washes off easier.
The only downside to the AG twins is they take a while to apply and buff off, even with finger pockets. Wide spokes and less off them it seems easier to maintain!
Geoff