Hi Manny,
On the rare occasions when I feel I simply have to get some piece of crap off my mirror I used lots of propanol to "loosen" it and then dab with a clean tissue. Do this lots of times and you should be OK. Most insecty animal marks have lots of oily goo so they should yield to the propanol.
Don't worry if you have to use a bit of pressure, just don't rub vigorously!.
Usually works. By The Way, most dirt doesn't detract much from your image so don't sweat too much about having a non-virginal optic - it'll still work.
Richard.
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