In a liquid measuring cup combine 1 part Dawn dish soap and 2 Parts Hydrogen Peroxide. The amount used will vary depending on the size of the bottle you are using for storage. Refer to post above for best amounts to use for common bottle sizes.
Stir the mixture and pour into a dark spray bottle for storage.
To use, spray the stain remover onto stain and allow to sit for one hour (minimum). For best result, use a toothbrush to scrub the stain remover into the stain. Launder per garment instructions.