Congrats. As long as you can't see anything on the button, do not clean it, you'll ruin the patina. To "see" the button a little better wipe some oil on it, it would bring out any detail and you can then wipe it off.
Congrats! Now that you've got your first one, time to find about 10000 more! You could let it dry out some more and toothpick it a little bit.
A little Vaseline or mineral oil will sometimes bring out the detail. But I only do that when there is no patina.Cooking oil?
You go, dawg! I've only found one and it was a great day. Nothing like those firsts!