You can really play around with the ratios, but the principle is the same.
1. Combine hydrogen peroxide and water in a spray bottle. (I use a spray bottle, pour in the amount of hydrogen peroxide I wish to use, and then add water to fill the bottle up. Give it a shake before each use.)
2. Clean any debris from the stain and soak up any liquids.
3. Spray the area generously with the mixture. (This works really well on my light colored carpets. I have also used it on clothing, couches, and hard surfaces. However, as hydrogen peroxide can have bleaching properties, test the mixture on a small and hidden patch of the surface you wish to clean before using the mixture.)
4. Let sit for 24 hours. The stain will disappear along with any smells.
Source of recipe: After figuring out what was in a natural pet stain cleaner, I decided to create my own.