Re: Dog drool on leather seats
sounds like the coating may be etched.
Be very careful if you do this but try a magic eraser on the spots. It will abrade away the stain. Do not scrub or you could go through the leather coating.
I've read about a few people who regularly use this to clean their leather until the day they go through the coating but by then it's too late.
I told my wife that a husband is like a fine wine; he gets better with age. The next day, she locked me in the cellar.