Yeah, when I really want to freshen up the disposal, I measure maybe 1/4 cup of baking soda, add a few drops of lavender oil and one drop of tea tree oil (Don't listen to Katuluu, tea tree oil is antiseptic and when combined judiciously with another scent, preferable to the odor of dead squirrels); then add 1/4-1/2 cup of vinegar, mix and pour down the disposal, then run it with hot water. You manly types might not be so much into lavender scent, but orange or lemon works just fine.