The key is knowing which type of cleaner or stain remover to use, which depends on (1) the type of upholstery and (2) the type of stain.

If your code says "W" you can use a water based cleaner on the upholstery, and if it says a "S" you can use a water-free product, such as a dry cleaning solvent.
If it says "WS" you can use either a water based cleaner or a dry cleaning solvent -- whichever is more appropriate for the type of stain you are trying to remove from the upholstery.
Hint: If your code says "X" do NOT use any of the cleaners below, because it means only a professional should clean your upholstery.
Once you figure out what types of upholstery cleaners you can use on your upholstery, next you need to know the type of stain you have on your upholstery.
Below is a video which provides helpful tips for removing stains from upholstery for certain broad categories of stains.
Each group of stain is treated slightly differently:
Most food and beverage stains - use a solution of 2 cups cool water plus one tablespoon of liquid dishwashing liquid.
Note, there are some notable exceptions to this. For specific instructions on specific stains please consult the A-Z Stain Removal Guide which lists all kinds of stains from avocado to zucchini, and lists specifically what kind of upholstery cleaner to use for the stain.
Berry and fruit stains - use a solution of 1 tablespoon of white vinegar plus two-thirds of a cup of rubbing alcohol.
Greasy and oily stains - first absorb as much of the oil or grease as possible by sprinkling the area with cornstarch or baking soda and letting it sit for approximately 15-20 minutes, and then vacuum up with the upholstery attachment on your vacuum cleaner.
Then, remove the remaining stain with dry cleaning solvent.
I hope these upholstery stain removal tips help you out.
For more information to assist you in removing stains on your upholstery review other areas of the site including the A-Z stain removal guide, the fabric care guide, and instructions for how to clean upholstery.
Photo by back garage from Flickr Creative Commons

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CAUTION: This website is provided for informational purposes only, and Stain-Removal-101.com provides it as is, without warranties or guarantees. Some stains just won't come out, and are permanent. Further, some stain removal methods can harm your item, so if the stained item is sentimental or expensive call a professional. See disclaimer of liability for more information.
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