Next time you wash your Jeep, wash your wheels extra good, and dry them thoroughly. Get some good carnauba wax (regular paint wax) and apply a few coats to all your wheels. (LET EACH COAT CURE!)
Makes a huge difference not only for brake dust but all dirt. Used to do it on all of my clients cars back when I was a detailer. Also, as an added bonus in the winter when they put salt/de-icer on the roads it protects your wheels!
If you want even better results, polish them with some mothers hand polish, then apply the wax.
I went from cleaning my Jeep's wheels once every 2-3 days, to 5-8. A little effort goes a long way if you're phyco about cleanliness like me
Save yourself the $8 for the armorall wheel protector BS, that stuff sucks.
I highly recommend Griots Garage products, they are simply awesome. Car Care Products, Detailing Supplies, Auto Accessories - Griot's Garage 800-345-5789
-Hope someone found this useful!