The green looks adherent rather than sticky or chalky and is quite nice in my opinion. I personally would leave it just like this if it was my coin.
I'm interested to see if the acetone does anything so please post some "after" pics to this thread.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz