The inside of your oven, microwave, and toaster collect all kinds of crumbs and food stains. Over time, this creates unpleasant odors and is just plain dirty. Get into a habit of periodically cleaning the inside of these common cooking appliances.
The first step is to read your manufacturer instruction especially to determine if you have a self-cleaning over or not. Next, you want to remove all the grill rack and wash them in warm soap water.
The next step in cleaning is to get a scraper to scrape off any food particles that you can. If you do not have a self- cleaning oven, then use a sponge and brush and all-purpose cleaning product to clean the inside of the oven. If you do have a self-cleaning over, follow the owner manual instructions.
Here is a quick video from expert village on manually cleaning an oven.
Here is a great video from Clean My Space about how self-cleaning ovens work and some tips at the end of the process.