Mix together 1 part Simple Green with 30 parts water.
Pour the cleaning solution into a spray bottle and spray the area of your carpet you want to clean.
Use a wet soft-bristle brush to scrub the cleaning solution into the carpet fibers.
Use a damp sponge to rinse each area of your carpet. Blot with a dry absorbent towel until the moisture is soaked up. You can also use a wet-dry vac to extract the remaining liquid.