Our one year old Boston , as a major dirty face problem.. Looking for ideas, to remove the brown under the eyes, he loves baths, just not washing the face - go figure..
I do the apple cider vinegar in the food as well, use filtered water to drink, wipe his face with eye wipes, and put drops in his eyes to flush out the dirt and such.
sometimes it can be worse with some foods, too. Libby's get worse with certain tuna treats that I had gotten in petsmart. They cleared up after discontinuing the treats.