Just go to Advance Auto Parts or Autozone and buy their store brand of 'Black Magic Tire Spray' or "Wet n Black"
I use it all the time.
I have read that the silicon in the spray can get on your wheel when you spray your tires and takes many , many miles for the wheel to burn it off. (Can resultin warping of the rotor) I think that's crap though.
If you are paranoid now, just buy the foam tire spray----- if you manage to get that on your rotor, what can I say...
2004 Liberty 4x4. All Black Columbia Edition
Sunroof, 5 spoke Graphite wheels
ADDED MAGNAFLOW stainless muffler, Turbolator exhaust tip, K&N drop-in, ECLIPSE CD5000 8V HeadUnit, Infinity KAPPA speakers (all w/ Dynamat) run off RF 800a4 amp, One 12" KICKER Solo-Baric L7 subwoofer - run off RF 500a2 amp, 2 AURA under-seat bass shakers using alpine Flex2 amp, Front/ rear Mopar window flares, front slush mats, eurostyle antenna, Power Horn with Uniden PA Mic, 3" Smittybilt step rails