Stains caused by grass are difficult to remove because they are "combination stains."

That green color comes from chlorophyll, which quickly sets into fabrics, so the quicker you act for removing these stains the better.
Below are instructions for how to remove these stains from fabric, but also from the less likely places stains from grass can turn up -- upholstery and carpet.
Step 1: Pretreat the stain with a paste of powdered laundry detergent (that contains enzymes) mixed with a little water, or with liquid laundry detergent (also containing enzymes).
Hint: In the alternative, you can pretreat the stain with a laundry prewash stain remover formulated to remove stains caused by grass.

Hint: Make sure the stain is gone after washing, but before you place in the dryer or you may set the stain.
If the stain does not come out after one wash you may need to repeat before placing in the dryer.
You may also want to soak the stain caused by the grass in a solution of hot water and laundry detergent containing enzymes, for a couple of hours or even overnight for especially stubborn stains. (Click here to see a tip about presoaking grass stains.)
In addition, you may want to see this video on removing stains from fabric caused by grass, using methylated spirits (a.k.a. denatured alcohol), which is an alternative method for grass stain removal.
Step 1: Mix a solution of two cups cool water and one tablespoon dishwashing liquid.
Step 2: Using this solution, sponge the stain from the grass with a clean white cloth.
Step 3: Next, blot at the stain until the liquid is absorbed.
Step 4: Repeat steps 2-3 until the stain from the grass is removed from the upholstery.
Step 5: If this completely removes the stain, you will next get plain cold water and a new white cloth and sponge the area to remove the cleaning solution, and then blot dry.
Hint: Be sure to get the upholstery only as wet as necessary to remove the stain from the grass.
If this does not remove the stain completely continue on with the following alternatives:
(a) Sponge the stain from the grass with acetone, if this is safe for the upholstery fabric. (Spot test in an inconspicuous area to find out.)
(b) Sponge the stain with dry cleaning solvent.
(c) Mix a solution of one tablespoon of ammonia with two cups warm water, and apply this stain removal solution just as you did the dishwashing liquid solution. (Again, be cautious with this method by first spot testing this cleaning solution in an inconspicuous area to make sure it will not harm your upholstery.)
You can get more information on how to clean upholstery here.
The instructions for removal of stains caused by grass from carpet is the same as for upholstery.
You may also want to watch this video on removing stains caused by grass from your carpet.
Do you have your own stain removal tip for removing stains from grass? If so, submit your tip about removing stains caused by grass here, or read other tips already submitted.
Are you a stain magnet like me? If so, check out the A to Z Stain Removal Guide which gives directions for how to remove over 100 types of stains from all kinds of surfaces.
Below are examples of the most common stains discussed in the Guide.
First photo by meddygarnet and second photo by HurleyFamily

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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.
See the A-Z Stain Removal Guide for even more types of stains.
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