If the stain is getting lighter repeat until the stain is removed.
Make your own water carpet.
Here are several excellent homemade carpet cleaning solution recipes for cleaning your carpet and getting rid of unsightly carpet stains.
For a mild non toxic cleaner that will leave your carpets smelling fresh mix white vinegar water salt and an essential oil like lemon lavender or pine.
Homemade synthetic carpet cleaner synthetic or human made fibers make up the majority of the wall to wall carpet market and are popular due to their strength durability stain resistance and affordability.
Apply a small amount of homemade carpet cleaning solvent to a white cloth.
Rinse by blotting with a white cloth soaked in lukewarm water.
Wait one hour or until the carpet completely dries.
That the machine cleans properly.