New M2C owner here since Feb of 2021.
91% alcohol+paper towel method worked perfectly for me today. I was ready for stretch/cling wrap, but didn't need it. Peeled right off in one piece. This car is very new: <2000 miles on it, and has not been outside in the heat much at all yet. I am convinced age+heat has a huge effect on how hard it is to remove the sticker. So, get this done early if you are a new owner!
As others have said for newer/fresher visors, I only needed to wait about 2.5-3.5 minutes before starting to peel. I suppose you will simply need to wait longer and deal with the challenges that comes with older stickers, or once that have been exposed to lots of heat already.
Thanks everyone for sharing their details, this community is great.
