alot of times mine gets brown looking after i wash it. i just put some meguires tire shine out of the spray can on them and they blacken back up.

 

At Autozone or Advance you can buy a spray cleaner called BLEACH WHITE. Works awesome at getting that brown stain that will not go away off.

 

+1 .. Proven To Work!

 

when ive gone mudding in the past they get real brown and it frustrates me, but theyre right. use that bleech white stuff. its in a white spray bottle. i spray some on the tires, scrub it and hose it off real good. i was my truck every saturday as well and i over do it, so when they get brown i let the bleech white sit on there for about 30 seconds and pressure clean the tires....look like they just came off the rack besides for the waer on the tread haha

 

Cool thank's for the responses