Minor grass strains will probably just wash out, but should you want to be sure you save those pants (or shirt, if things got more dramatic outside today), there are two great ways to do so.
First, you can use vinegar. Just make sure to use white vinegar — balsamic will make things so much worse.
- Soak the stained portion of the garment (usually the knee) in undiluted vinegar for at least a half hour.
- Launder as usual, but, of course, don't use the dryer!
- If stains persist, let the garment to air dry, then try again with vinegar, or use our next approach.
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Clean grass stains with toothpaste. Just make sure it's a white paste.
- Spread a thin layer of white toothpaste over the stain
- Soak a toothbrush in clean water, and then gently scrub at the stains. Yes, this does contradict the earlier admonition not to scrub. It's the only time I'll do so, but the fact is, that stain is already worked deep into the cloth.
- Launder as usual.
Buy a two-pack of Arm & Hammer Advance White Extreme Whitening Toothpaste on Amazon for $5.49