Highly recommend the wheel protectant. Also called brake repellent from Armour All. You do however need to buff it off a bit after a bit of time on black wheels. It leaves like a slight multicolour streak. Good for between wheel washers. Won't totally stop brake dust on wheels, but found it good to keep wheels looking good longer. Also Meguire's products on sale as well 35% off.
I nornally get a few cans of the wheel protectant. Stocked up already, from last sale. For those that haven't tried it yet.
Don't do it