Hydrogen Peroxide Solution 3% 10 vols is used as a mild skin disinfectant for minor cuts, wounds and skin ulcers or as a mouthwash or gargle solution. Hydr Peroxide 3% Solution Hydr Peroxide Solution kills disease organisms by oxidation. The liquid works as a mild disinfectant and deodorant. How Does Hydr Peroxide Work? When hydr peroxide reacts with organic material, it breaks down into oxygen and water and can be used to treat leg ulcers, superficial skin infections and sores that have been caused by lying or sitting in the same position for long periods of time, also known as pressure sores. It can also be used to disinfect and cleanse the skin, or as a gargle and mouthwash solution. 3% Hydr Peroxide should not be used as a mouthwash by children under the age of 12 but can be used as a disinfectant by people of any age.