20% clear peroxide is available in Sally Beauty supply stores and from their website: https://www.sallybeauty.com/hair-color/other-products-and-applications/developer/20-volume-clear-developer/SLNCAR61.html
They also have 30% and 40%, which will clean your pieces faster but are more caustic to the skin. Rubber gloves are essential. If you ever do get peroxide on your skin, a paste of baking soda and water will neutralize the acid and stop the chemical burning quickly.
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