Best way to clean crud from a coin is an acetone bath. But yours has verdigris which is nigh impossible to permanently remove, a short term measure could be pure lemon juice and salt mixture dabbed onto the affected areas but it will come back after a while. Best bet is to get another cleaner example of the coin and scrap yours
This coin was already polished to hell and back or cleaned in maybe resulting in the forming of the bronze disease/verdigris (soft crystals / hard crystals). If it is bronze disease the green should be removed because it is propagating with moisture exposure and will eat away at the substrate, if it is verdigris the damage will be less intense and might even protect the surface from further damage. But to me it looks more like bronze disease with the deep pitting.
This coin was already polished to hell and back or cleaned in maybe resulting in the forming of the bronze disease/verdigris (soft crystals / hard crystals). If it is bronze disease the green should be removed because it is propagating with moisture exposure and will eat away at the substrate, if it is verdigris the damage will be less intense and might even protect the surface from further damage. But to me it looks more like bronze disease with the deep pitting.
I agree on second look verdegris is much lighter green
