Nice, Nice find !! Well done it gives us all hope.
Lets get some facts strait here.

First remember this is a dug coin, when you send it in to the grading company. They will most likely grade it as Dug or Environmentally Damaged and cleaned.

In most cases this will fall under AU-50 only if the coin can grade AU-50.

I would not clean it at all just have PCGS do it.... I don't think it will scratch much more than it is in the plastic 2x2 you have to send it in but...

I am not to sure about that I may just rinse it off and blot it dry then send it in. Anyway to that effect it is dug so I would not worry about it to much. Even with a few scratches the thing is still worth several 100 dollars and you can't beat free money.

Next fact you don't just need a good find to make the banner. Good pictures and a good story helps too... If you think this find should make banner use the link on the bottom left of the original post. Adding a post that says banner won't do much good.
Again awesome find, Congratulations. Go buy something cool....
Keep @ it and HH