I spilled Minwax Dark Walnut Stain on my brick/rock wall...?

Can anyone help??? My fireplace is centered on a beautiful brick/rock wall in my house. While staining the beams overhead I accidently dropped stain in about 3 or 4 spots on the wall (didn't have anything with me to cover it with). Three of the spots are small but one is quite large and noticeable. I tried everything I could think of...any ideas or know of any products that would remove the stain???