Most lily stains come from the flower's pollen. Use a transparent tape, oxygen bleach and water to remove the stain from washable fabrics. Plan to soak the garment for 30 minutes before following normal laundry procedures.
Use transparent tape
Remove as much of the pollen as possible using tape. Press the tape over the stain so it sticks to the grains and lifts them off the fibers. Do not rub the stain or attempt to remove it with any sort of cloth, as both actions can force it deeper into the fabric and may cause it to spread.
Determine appropriate care
Read the manufacturer's label. If the garment is dry-clean-only, take it to a professional cleaner, point out the spot and indicate the source of the stain. If it is washable in water, proceed with the next step.
Soak in oxygen bleach
Add a small amount of oxygen bleach to a bucket filled with cold water. Mix to dissolve the solid material and add the garment to the bucket. Soak and rinse the garment. Repeat if the stain remains visible.
Wash the item
Spray the stain with a laundry stain remover. Wash it in the warmest water the manufacturer recommends with laundry detergent. Rinse and hang it to dry to prevent setting the stain. Once you are certain you have eliminated the stain, launder as usual.