How would i get these soiled stains off my sock!!!?

i have white socks with a puma >colored< emblem. i dont want that to turn white but then i have the soiled stains(like from walking outside lol me). is it oky to use baking soda or w/e?like this link ...could i use this too? a href="http://answers.yahoo.com/question/index;_ylt=Aiajj2jUyZcr4hSqQ_IMt1kjzKIX;_ylv=3?qid=20070725105647AABbeWA"http://answers.yahoo.com/question/index;…/a