More interestingly, I had a stubborn substance stuck to the "translucent" mirror. Eyelead removed this easily. Reminder: this is an "off-label" use of Eyelead, you are on your own - do not blame me if you mess up your mirror!
Generally, I advise caution: wherever you use Eyelead, do not press too hard, and remove it Quickly but gently. If you press hard it sticks hard, please be careful so you do not delaminate or distort something.
I apologize for writing this in English - if I tried in my limited German, NO ONE would understand it! Thanks.