Use a Hydrogen-Peroxide Spot Treatment for This Stain

Use a Hydrogen-Peroxide Spot Treatment for This Stain

The brown bottle of hydrogen peroxide in your medicine cabinet is usually a 3% solution, and it is a mild bleaching agent that also breaks down some stains chemically. University of Georgia Extension lists 3% peroxide as a stain-removal product that acts as a bleach and says to test colored fabrics first. Cornell Cooperative Extension's stain guide names the 3% antiseptic strength, warns against the stronger hair-bleaching strength sold in cosmetic aisles, and caps contact time at two minutes. On blood, catalase from blood and damaged cells speeds the breakdown of peroxide into water and oxygen, which is the fizz you see, and the reaction helps loosen the stain. Rinse the fabric under cool water first, because heat sets protein stains.

Start with a test, because peroxide can lighten dyes. Put a drop on a hidden seam, wait a few minutes, and blot it dry to check for color change. On white cotton, use 3% as sold and keep the contact short. Skip it entirely on dark, bright or printed fabrics, where a pale patch can be worse than the stain you started with. Also avoid metal containers, which UGA advises against.

After the treatment, rinse with cool water and launder as usual. Look at the spot before the item goes anywhere near the dryer, and repeat the treatment if a shadow remains. The CDC notes that peroxide stored in dark containers decomposes at under 2% per year, so keep it in its original dark bottle rather than transferring it. Peroxide can still weaken over time once opened, so do not count on an old bottle to be at full strength.

The big safety point is what peroxide should never meet. Do not mix it with vinegar in the same bottle, since the two form peracetic acid, which the Missouri Poison Center calls corrosive and irritating to skin, eyes and lungs. Do not combine it with chlorine bleach or ammonia either; Washington State's Department of Health notes bleach reacts with hydrogen peroxide. Use one product at a time and rinse between steps. If a cleaning product was mixed by accident, or someone breathes fumes or swallows some, move to fresh air, open windows and call Poison Help at 1-800-222-1222 (America's Poison Centers, US). Call 911 for trouble breathing, chest pain or collapse.

Source: University of Georgia Extension, Textiles: Products; Cornell Cooperative Extension, Removing Stains at Home; CDC, Chemical Disinfectants (Guideline for Disinfection and Sterilization in Healthcare Facilities); Science Notes, Why Does Hydrogen Peroxide Bubble on a Cut?; Missouri Poison Center, Some Things Just Don't Mix; Washington State Department of Health, Dangers of Mixing Bleach with Cleaners. Note: test on a hidden spot, since dye response varies.

General household-cleaning guidance, not medical or professional advice. The label on your product always wins; never mix cleaning products. For a poisoning emergency call Poison Help at 1-800-222-1222 (US), or 911 if someone has trouble breathing.

How Hydrogen-peroxide spot treatment compares

* Illustrative starting amounts and notes, rounded -- use the calculators below for your exact numbers, and always check your product label.