Photo from here
To deodorize your garbage disposal place half a lemon and a handful of baking soda into it. Turn on cold water and the disposal, of course take the appropriate hand removal precautions and the unit should clean itself.
We recently got rid of ours, but it was a grimy mess. I purposefully do not have photos. We used lemons to clean the inside of it before we donated it to Goodwill. Here is what we did:
Squeeze half a lemon into two cups of water inside a microwave safe bowl. (I leave squeezed lemon inside the bowl, but this is not necessary.) Run your microwave on full power for approximately 3 minutes, until the water boils. Leave the bowl and lemon water mixture inside the microwave to sit for approximately five to ten minutes. You want to let it sit to let steam continue to build inside your microwave. Keep in mind, the bowl and contents will be very hot. After your wait time, carefully remove the bowl and use a clean rag to wipe the inside walls of your microwave.
If you have copper bottom or solid copper (lucky) cookware you can use a lemon to remove spots. Simply cut a lemon in half, sprinkle some baking soda or salt to the exposed cut area, and rub the lemon slice on your copper cookware. Then, rinse with water and dry.
Lemon can be used on countertops to deodorize and to naturally bleach out stains. Simply squeeze lemon juice onto the countertop to do both. Let the juice sit on top of the stain and cover with baking soda, then scrub the countertop off.