A few weeks ago, on both Monday and Tuesday, I got a grease mark on the knee of my pants. The first one didn't wash out with just a stain spray, so I looked for other treatments. (What is it with me lately, and marks that don't come out in the laundry?)
- How to Get Grease Stains out of Clothes | Cleanipedia
- How To Remove Grease From Clothes: Home Remedies & Tips
- How to Remove Oil Stains or Grease Stains from Clothes
I am happy to report that dish soap (I had Palmolive in my kitchen) and a little scrub brush action before letting it sit in the laundry basket for several days worked just fine!
For grass stains, also common on knees, read Grass Stain Removal at House Cleaning Central, especially the note not to use ammonia, degreaser or alkaline detergent. I was impressed with how much peroxide and bleach removed (although not all).