Thanks. After all the afternoon of work, I have cleaned it and removed all the sticky "film", now it is as new but better because it will never be sticky again.
I have used meth in a little glass and soaked small zones with the help of little cotton sticks (these used normally for the ears). And then rub with nail, little plastic sraper as you suggested and some old cotton T-shirt now used as cloth for cleaning.
After that I have applied a car black plastics restorer from krafft and now it seems like new.
Finally I can enjoy another time of my MSFF2. Thanks a lot for the advices!
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