You can do all kinds of cool things with citrus peels other than tossing them. Next time you peel an orange, lemon, or grapefruit, toss those peels in your dishwasher. Photo by Gerry Machen.
Citrus peels are great for all kinds of culinary applications, but they also make wonderful deodorisers for things like refrigerators and garbage disposals. You can even use them in your dishwasher. Just toss them (rind and whatever pulp is attached) into the silverware strainer and run a regular cycle with whatever load of dishes are ready for washing. The citrus will help break down the gunk on the inside of the dishwasher and clear out any lingering odours. As a bonus, the citric acid will also help get glassware sparkly clean.
What to Do with Citrus Peel [Local Kitchen Blog]