Hi Sue: You can make a paste of vinegar and cream of tartar (the dry stuff). Put it on the door and let it sit for about 30 seconds. Then, use a plastic putty knife to scrape the crud off. Then, wash down with a clean moist cloth. You may have to wipe it down a couple of times to get everything off. This has no smell and is environmentally safe. You can use this on cruddy pots and pans and cookie sheets. Anything that has burnt on crud:) Good luck
If you know the make and model numbers of your stove, you can go to You Tube and enter your numbers and they will give you a step-by-step tutorial on how to take the door apart for cleaning. They have tutorials on everything under the sun.
I found my owners manual & it had directions how to do this! It really is worth the few extra steps! But having a handy person to help take it apart also helps!