I cleaned it with baking soda and warm water,wrong should I left alone
BUT... If you planned on keeping it anyway, who cares! Enjoy the fantastic coin.
Here's a for instance: this coin was open to the air and in the back of a desk. When I found it had some dust and was sticky to the touch, so I used light detergent and a Q-tip. When I showed it to the dealer (not offered for sale - just for an opinion) he said "artificially toned and cleaned". Both true, I suppose, but I still think it's a neat coin (the tone has many colors in it - like an oil slick).
View attachment 1206041
Great looking Barber.