When chlorophyll, xanthophylls and carotenoids from fresh grass are ground into cotton, removing the complex mix of proteins and organic pigmented compounds can be difficult. Pretreat with a full load’s worth of liquid detergent poured onto the stains. Scrub until the stains start to disappear, wait about ten minutes then launder in cool water. Repeat until all signs of stain are gone— heat from a dryer or iron will set stains permanently. Our cleaning experts can take care of knees and elbows marked with green—let us get the stains out.