Does anyone have any ideas on how to get out Lily pollen stains out of my white carrera marble countertop? It has stained the marble yellow and I can't get it out.

I've tried the following so far, and no luck:

-Alcohol scrubbing with Toothbrush

-Laundry Detergent + scrubbing with Toothbrush

-Poultice - paste of flour with dish soap + water, but I only left it on for about 12 hours.

Any recommendations/ideas are welcome.