I think that after few offroad trips you'll be laughing at those scratches, but if you want to buff it off you could try Scratch X : MeguiarsDirect.com:ScratchX® 2.0 ScratchX® 2.0
Thx. I think I just started the process of "adding character".
I think this will mess it up even more because I don't think that's a painted surface is it? (it's not painted on my TE bumper, not sure about the SR5/LE bumpers??) Trying to use a scratch remover intended to polish a scratched clear coat in to a crystal clear shine is going to lead to no good on a piece of raw textured plastic
Just leave it alone OP, or if it really bothers you do what 1000MPH said.
Hmm, my bumper is painted I think, at least it's the same color as truck and it's white when you scratch grey paint deep enough. Never occured to me to buff off scratches from it. Anyway whatever stuff you use on your paint try it first at the some hidden place to make sure it works.