Congrats on the nickle.
I started detecting about two months ago with a Bounty Hunter Time Ranger and haven't left the yard. I'm up to near about $1 in clad, mostly penny's, three wheats the oldest is 1952, two match box toy tanks, a match box cement truck and whole bunch of scrap. I think this place used to be a dump, but not that old of a dump. Anyway, I'm having fun, learning how to detect and haven't left the property. My yard is getting aerated in the process.
I don't know much about cleaning but I'd like to know as well.
I love this site.