Vinegar and orange peels. All purpuse cleaning agent. Tried and love it. Use it for Everything! I add a few drops of tea tree oil and grapefruit seed extract for anti mold/fungal/bacteria and a few drops of vanilla and orange extract for scent. ***Spray it on shower doors and then rub some dish soap and rinse when you are finished with shower and hard water stains vanish without scrubbing.