1. Bacterial Infection/Low Enzyme Levels
2. Systemic Imbalance/Stress
3. Red Food Coloring in Dog Food
4. Iron in the Water Supply
5. Eye Allergies/Eye Goobers
6. Watery Eyes/Hair In Eyes
7. Unclean Environment
8. Bad Ventilation
I am always trying to provide new owners with the best information out there so they can try different products/regimens until they find the one that works.
Here is an article from Maltese Only http://www.malteseonly.com/teartonia.html
This is a product linked to their page however I have not tried it http://maltsmart.com/Stay-White-Tear-Stain-Remover.html
Here is a review from Maltese Obsession using a product called Eye Envy which I have heard is highly recommended.