Clipping the eye hair short could also be an issue. Bogey had a staining problem too when I kept his eye hair trimmed because as it grew it would poke into his eyes. It was a pain growing it out but now that I keep the hair on his muzzle long the weight pulls it down. He not longer has tearing issues. There might be slight eye boogers but those are easily combed away. This was the only things that helped for him. Good luck
