I would have used my nail polish remover
Thank you so much for the reminder on the pure Acetone! You have no idea how much you just saved these Buffalo's! Unfortunately, I believe two look like they were touched with a cleaner that isn't approved just by the uncharachteristic color but the rest were left alone which is best. I believe I have some treasure's in these once they are de-grimed!
Oh, and to the unhappy journal poster...no I do not ask a Barber how to cut my hair as I am female and go to a professional stylist however, I do not pay and enjoy a club made up of stylists nor would I wish to. I come here to learn about and enjoy being a numismatist, which is what I believe this is what this place is for. Unfortunately, there is too much conflicting information on the web to take seriously and here, I know is a group of serious numismatists who know what they are talking about! So basically, that's sort of apples and oranges to me.