To remove grass stains from jeans, pretreat the fabric with a vinegar mixture, allow the solution to sit, scrub the stain and launder using an enzyme detergent. The process takes about 15 minutes longer than the normal wash and dry cycles.Continue Reading
Mix a solution of one part white vinegar and two parts water to apply to the stain as a pretreatment solution. Apply the solution to the grass stain. Store any remaining solution for use the next time you have grass stains on jeans.
Allow the solution to soak into the jeans about 15 minutes. Use a toothbrush to work the vinegar into the grass stain.
Use an enzyme-based laundry detergent to wash the jeans. Most commercial laundry detergents have an enzyme base, but read the label to be sure. The nature of these detergents allows them to break down proteins, such as those in grass stains, and lift them from the jeans.
Remove the jeans from the washing machine, and inspect to ensure complete removal of the grass stain before drying. If any stain remains, treat again with vinegar and repeat the wash cycle. Avoid drying until you have removed the stain to prevent it from setting.