I don't know how long I was suppose to keep ...

I don't know how long I was suppose to keep trying, but I did it for a week and all it did was clean the goop out of my pup's face, but the staining didn't lighten at all (the old stains). Maybe I'm not using it correctly. Anyway, it may work for your dog. Tryout #3. On the lookout for #4 to try.

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