I found out about a product that is basically hydrogen peroxide gel. It's available at beauty supply stores under the name "creme developer" or "creme peroxide". It comes in various sizes and strengths. I went with a 32OZ 20 Volume.
http://www.sallybeauty.com/20-creme-developer/SBS-760120,default,pd.htmlHere is a before and after picture. The left is after being covered in the creme, placed in a large ziplock, and left in the sun for about 3 hours.