I would first try just scrubbing with a scrub brush and water. If not removed, then very light pressure with a pressure washer. If that doesn't work, I'd go to a paint store and buy a couple different colors of gray stain for stone and use a very light hand and daub it on the spot to take away the pink. Your surface will eventually have some stains from lots of different things, so even if you end up with a little darker spot, it will be less noticeable than the pink. It wouldn't be permanent, but you could also look for a gray permanent marker to cover the pink. Just redo as it wears off.

^^^ I would try water with some brush even like old tooth brush or some dish sponge. If it doesn't work a little baking soda with dap of water and brush.