Is there a good product to use that removes tear stains from underneath my puppy’s eye and on the bridge of his nose?

The reason for the discoloration from tear stains is due to bacteria living on the moist hair & an oxidization process.  There is a product available over the counter called “Angel Eyes” which is an antibiotic supplement that can be added to the food, in more severe cases if the skin is irritated/inflamed a veterinarian may prescribe a course of antibiotics such as doxycycline.  For the nose or other areas whitening shampoos can also be helpful but be careful around the eyes when bathing.