Gamma blue 11 cleaning?

[jumpman23j45]

So I just bought these gammas blues and the dude said he only wore them a few times but the soles are fairly yellow how can I clean this? I heard toothpaste works? ThanksView media item 910097View media item 910098View media item 910099

 

[SteveSteve72]

Ask in here http://niketalk.com/t/15471/official-sneaker-care-maintenance-post-its-back