Corvid..1-WELCOME to Tnet! 2-AWESOME finds! Many of us here have not ever found a genuine silver spill like yours...me included, so kudos on that...and the Franklin half STILL eludes me, still on my bucket list..as far as the green residue on your silver Washington, a little lemon juice should help. It's not a key date so you don't have to worry about subsequent damage and/or de-valuing it...clean it and enjoy it! Congrats on an excellent hunt..ddf