texas*princess, there's a product called Angel Eyes that's supposed to be good for the tear stains - assuming that it's not genetic or diet related. I haven't been able to find it (yet) but I do know that it's important to keep the staining to a minimum. It could be an eye infection. I use just plain water to loosen the night stains, then an over the counter "whitener" for tear stains afterwards.
I haven't used this, but it comes highly recommended:
All Systems Super Whitening Gel 8 oz
www.petedge.com has a LOT of the same items as the pricier sites, but is much less expensive.