Can anyone give me some ideas for good tear stain removers? I rescued Nash in January and he had a few, but nothing bad, but lately it's gotten worse. I was his eyes 2x a day, give him distilled/spring bottled water only to drink. He is on Instinct kibble. I've tried a few tear stain removers I've bought off Amazon and the latest one...i swear it's worse since I've been using it so its now in the trash. I know not to use Angel Eyes so never used that.