Combine ingredients and pour into a dark glass spray bottle and shake well to combine. Hydrogen peroxide is sensitive to light so a dark bottle is essential for maintaining potency.
Store in a cool area out of direct sunlight.
To Use DIY Stain Remover
If there is any concern about colorfastness, do a patch test on a small area before spraying the stain. When you're ready to treat the stain, shake the bottle well and spray it directly on the stain.
Sometimes I let it sit and then just throw it in the wash. If the stain is particularly pronounced I spray the area and let it to sit for about 5 minutes, then rinse while rubbing/scrubbing the fabric with a stiff toothbrush. (Not the soft brush I use on my teeth!)Then I reapply a second time and let it sit until I do laundry.