Failure: Cleaning cookie sheets

The other day my son was playing at a friends house for a little while, I was kind of wandering around trying to figure out what project to start.  

While I was in my kitchen it donned on me, my old horrible-looking cookie sheets!

I had just found a 'trick' on Pinterest, it's supposed to clean off all that dark looking stuff and make them look all silver and shiny again.  All you need to do is grab some baking soda and  hydrogen peroxide, let it sit for a while, and it should wipe right off, NO scrubbing.  (That's the part that caught my eye!)
I am sad to say this is the first time something I've found on Pinterest has let me down :(

Here is what my cookie sheet looked like to start out with, not too pretty, I know...

 I did just what she did, I poured the baking soda on first,