question about tear stains

Ok, I'm going to be bad and post something about a d-o-g in the cat forum! LOL! My friend has a Boston terrier that has a problem with tear stains sort of like the persian cats and I was wondering what would be the best way to clean his eyes up?

You know, I don't know the name of any. I can tell you that I have seen products sold at Petco just for the dogs though.