Add orange peels (or any citrus peel) to a quart of white vinegar in a closed container and let it set for two weeks. Combine citrus/vinegar solution half/half with water and use for cleaning. Works on floors, tile, fixtures, etc. Smells good and is tough on scum! Best of all there are no chemicals.
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If you notice ants hanging out in your kitchen, just place a few orange peels around problem areas. Although you may think that fruit would attract ants, the little buggers actually hate the acidic scent of orange peels, and they'll move on to a more pleasing environment. When rubbed on skin, orange peels are also an effective mosquito repellant.