Just remove the mirror effectdo you accept scratches ? or do you just want to remove the mirror effect?
Thanks for your help , I m going to try thisI would use 5000 grit sanding stick and give the case and all over.
Another method is to use the inside of an old leather belt, and rub until you are happy.
try with the underside of the case, or the caseback to check if you like it
before you hit the top of the watch head