Mix 1/2 cup of Washing Soda with 1/2 cup Hydrogen Peroxide in a large bowl or bucket. Add in hot water till your bowl is half full. Add your dirtiest, dingiest, filthiest clothing to the bowl. Make sure each piece gets thoroughly soaked. Add just enough more water to cover the clothes. Stir a little to make sure it is all mixed up and each piece of clothing is covered. (I did this with just a batch of socks so a bowl worked great for soaking. If you have a large batch you can add this mix to your washing machine and let it set for a while before letting it finish out with a rinse cycle.) Let your clothes soak for at least a few hours. Overnight would be even better. After allowing it to soak toss the clothes and mix that was in your bowl into the wash, and launder as normal.