1) Apple Cider Vinegar - A natural non-toxic folk household cleaner that has traditionally been used for deodorizing, disinfecting and to control the growth of unfriendly bacteria and other microorganisms. Used by Hippocrates (the founder of modern medicine) in 400 BC.2) Deionized water base - Deionized water has been treated to remove all minerals and inorganic chemicals.3) Hydrogen peroxide - Generally found helpful in softening and removing ear wax.4) Magnesium and Zinc sulfate - Used in folk remedies for their tonic and astringent capabilities.Natural Ear Care comes in a .5 Fl. Oz. (15mL) bottle, which is much smaller than the 4 fl. oz. ear washes typically found in stores. This is because our formula is much more concentrated and effective. Besides, if you've ever had water violently squirted in your ear, you'd know why we don't feel it's necessary to do that to our beloved pets.