I know there are products I can buy to clean up the "goopies" underneath my dogs eyes, but does anyone know of any "home remedies" for this? Just plain old water on a soft cloth or cotton ball doesn't seem to be taking it off and his face is getting a little stained. I'm not sure what to try and want to be careful what I use around his eyes. Barring that, do the products I can buy in the pet store generally work pretty well?