Did it Work?

For this "Did it Work?" I am giving the evil eye to my Avalon cookie sheet. This thing has been around for 3 years, is nice and sturdy but is now stained with ugliness (aka baked on grease).

After doing a little pinterest searching, I kept coming across a "baking soda and peroxide" mixture that supposedly gets rid of the ugliness of baked on grease. Excited to clean things up, I created the mixture.

Here is the pan and its ugliness 

 

 And the items used to clean it. I mixed these together till it created a paste.

 

I let the paste sit....

 

I scrubbed my life away...

 

 And here is the result. Waa Waa :(

 As you can tell... nothing changed. Any suggestions on other things I can try to bring it back to its glory!?