Hero's tear stain

Hero's tear stain is getting worst. The tear stain is brown in color. This make his face looks so dirty. I have been cleaning his face and tear stain everyday, yet the stain still there and the color is getting darker as time passed. Hero has a new name now.. "Ah Pek" (uncle)... because the tear stain looks like an eye bag. I am going to bring him to the vet for a body checkup, to examine if he is not feeling well with other part of his body and causing him tearing so often. Hero... Hero... how I wish you can talk in human language and tell me which part of your body is not feeling well...