I had a good time. Was nice to be out doors and got some exercise....
Yes. I use olive oil on all my finds to help losen the dirt. On copper it will get rid of the green oxidation. It does make copper look darker, but I still think its worth doing to clean coins.
It can take months to soak off all the dirt.
If you're not worried about the value of your finds and want to get it cleaned electrolysis works well too..