You make sure that your watch is at least good to be worn in the shower; then get it wet........
Take an old toothbrush....get it wet, apply some toothpaste (I use the regular all white Colgate)
on ontop of the bristle (like you're going to brush your teeth!) and then slowly spread it all over the
case (front and back and the bracelet if it's metal) and brush gently all over...........
When you get done......your watch would be as "Pearly" as those nice beautiful teeth of yours!
It puts back the "Smile" in your watch! You'll think it's brand new!
Have fun!
F-