I finally got around to trying to clean my sunvisors and I have got to say that the suggestion by
dseretakis to us Mr Clean Magic Eraser sure did the trick!
As soon as my wife heard me reading off some of the suggested cleaning methods, she was certain that the Magic Eraser would work. Well I gave the silly eraser a try and was pleasantly surprised to learn that she and
dseretakis were correct. The vinyl that I could not seem to get cleaned before using other simple cleaning products now no longer has the marking from where I removed the aftermarket mirrors. the entire area of each sunvisor now looks brand new.
I was so happy that I could clean and remove the residue without having to paint or alter the vinyl.
Thanks you all, and Thank you Mr Clean!
Jim