todays digs

I recently came across a post on Facebook talking about a lost ring. It gave the location of where it was most likely lost so naturally, I went over to go look for it. Sadly the park was way too crowded to hunt in at the moment so I decided to hop on over to the nearest piece of grass I could...

I found this coin while exploring a new site next to a creek in the woods near my home. I've identified it to be a liard from Luxembourg dated 1759-1760. https://en.numista.com/catalogue/pieces30723.html The problem is I don't know how I should clean it. Normally I just brush away the surface...