Elbow grease. If you do manage to get it clean, make sure you seal it with the best water based sealant you can find. Using any sort of chemical agent is likely to bleach it.
If it's a small area and you have some of the grout, it might be better to just use a grout removal tool and replace the grout. If the grout wasn't sealed in the first place, cleaning it might not help anyways since the stain will just leech back to the surface.
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