As you may know or not, we just got a new edition to are family. He is great...only had one accident due to not taking him out after eating supper. Anyways I was wondering how can I keep him looking as white as he can. I am going to Petco and they have a shampoo that highlights the white. But how can I remove the tear stains that are under his eyes, stains on his forhead, and also stains from being neglected by previous owner?