Although you can buy over-the-counter tear stain removal products, always check with your vet before making such a purchase. (cuteness.com)
If you can't resolve the problem at home, check with his vet for advice. (dogsora.com)
Many cats love a little broth and flavour added to their food, but please check with your vet if this is appropriate for your cat's situation. (vetbabble.com)