Washing a headbow? Help!

[haleyjujucake.livejournal.com]

So, I bought this dress and headbow set, and although the dress is absolutely gorgeous, the headbow looks yellow and dirty in comparison to how it's supposed to.
If it helps, this particular bow is the white colorway of Marchen Ribbon.
Hopefully one of you can help me out! I don't think I will wear the headbow if it stays looking like it does now, so gimme some ideas if you've got them!