NOT a BD smoker. However our oven door glass gets super baked-on crud that is almost impossible to remove..I have used, a concentrated orange cleaner, scraped with a razor blade, degreaser and steel
wool. The problems were: scratches, cleaner and solvent migrating behind the glass and just not clean.
What works very well is to mist the glass with water (the door must remain open in the horizontal position for the entire process), the apply baking soda to the entire surface making sure it is fully saturated.
Then WAIT, just don't let the B S dry out. Finally using a paper towel or discardable rag, wipe clean.. I refused to believe this would work until I tried it. The "Wait" time depends on the how baked-on the
crud is. If you don't wait it won't work well. A bonus is it is more environmentally friendly.