Having finally found my first 3" Meg I was disappointed as it dried and took on a rather shabby look. When I first pulled it up it looked nice, clean and glossy while it was wet. Of course I was also partially blinded by its size. Here is what it looked like after drying a bit the day it was found (next to and earlier find for size/finish comparison):
To clean it up I first used a soft bristle toothbrush and plain soap and water. A lot of the brown stain was easily removed with that first round. I then soaked it for 10 minutes in a 75% water 25% vinegar solution and again went over it with the soft bristle brush. All things I learned here on the Forum! I will now let it soak in water, rinsing it frequently, for a week to make sure all the vinegar is removed. Here is what it look likes now: