Here is where most people mess up. You wash the clothes, you see no visible stain, and you throw them in the dryer. Don’t do it. The heat from the dryer will set any microscopic leftover pollen permanently. It’s like giving the stain a super glue bath.
Does Lily Pollen Come Out Of Clothes at Donna Casas blog
Instead, air dry the garment first. Hang it up in the bathroom or outside in the shade. Check it when it’s dry. If the stain magically reappeared (it happens), repeat the pre-soak step. Only when you’re 100% sure it’s gone should you tumble dry. Patience, young grasshopper. Your clothes will thank you.