umm well, firstly i use a little scrubbing thing which like scrubbs/scratches off most of the dirt, then i use a spray bottle and then wipe with a rag or old shirt which takes works pretty well and then i use mr sheen and then it looks all shiny and new

anyways for sarrazin19 - i used to wear white boots and what i have is this little product sorta like thing where after u clean ur boot to as good as u can, u apply it and it sorta restores the white colour, its got a lil spongy thing at the top so its soft when u apply it
i dont know where it was bought from but any good sport shoe type of shop should have something like that.
i just checked it and its called Kiwi sport white leather restorer :S if it helps
umm also this is in AUS , i dont know if it helps you but yeh