The key with a furniture stain is to make sure you remove any type of finish that might have transferred to the carpet with the furniture stain. For that you'll want to use a solvent, such as Pro's Choice Pro-Solve Gel. Put it on there, agitate and extract. After that you can use your organic stain remover, like Pro's Choice Stain Magic, to remove the furniture stain.
It may take some time for that product to work, so I would recommend you spray it on there, agitate and extract. If the stain still remains, spray Stain Magic again and leave it. You can even cover the Stain Magic with saran wrap to help trap in the heat from the product, which will help it work faster.
I've never used Stainzone, but I know that the products I mentioned above will work. Give me a call if something doesn't make sense. Thanks.