Hydrogen peroxide is the simplest peroxide (a chemical with an oxygen–oxygen single bond). It is a colorless liquid at room temperature. Small amounts of gaseous hydrogen peroxide occur naturally in the air, but it is unstable and decomposes readily to oxygen and water with release of heat. Hydrogen peroxide is used as a chemical intermediate, as a bleaching agent in the paper and textile and pulp industry, and in water treatment operations.

Here are some other uses of hydrogen peroxide :

• Remove sweat stains – Place mixture of 1 part dishwashing liquid and 2 parts hydrogen peroxide on affected area for 1 hour.
• Remove blood stains – Pour directly onto stain and let sit for 5 minutes before blotting and rinsing in cold water.
• Clean kitchen sponge – Let sponge soak in bowl of equal parts warm water and hydrogen peroxide for 15 minutes before rinsing.
• Clean toilet bowl – Pour into bowl and let soak for 20-30 min before cleaning with scrubber.
• Whiten your teeth – Brush teeth with fluoride toothpaste. Rinse with 1 part water and 1 part hydrogen peroxide for 30-60 seconds. Spit out and rinse, do not eat or drink for 30 minutes. Never swallow hydrogen peroxide.
• Clean vegetables – place hydrogen peroxide in spray bottle and mist over produce. Let sit for 5 minutes before rinsing and drying.
• General cleaner – Add to dishrag and wipe counters and tabletops.
• Disinfect toothbrush – Soak in hydrogen peroxide periodically and rinse off.
• Remove mildew – Spray/pour directly on mildew and wipe clean.
• Sanitise chopping board – Wipe board down with paper towel and vinegar, and then again with hydrogen peroxide.
• Foot fungus cure – Mix one pint hydrogen peroxide into 1 gallon clean, lukewarm water. Soak 20-30 minutes morning and night and dry completely afterwards.

Be careful in using hydrogen peroxide. Ingestion of hydrogen peroxide may produce oxygen bubbles, or oxygen embolism, in the blood, resulting in hemodynamic compromise, including cardiovascular collapse. There is inadequate evidence in humans for carcinogenicity, genotoxicity, and reproductive toxicity of hydrogen peroxide.

Reference : https://img.wonderhowto.com/img/87/95/63544551137201/0/11-awesome-uses-for-hydrogen-peroxide.w1456.jpg