I figured out that I have to use a soft plastic tool, which looks a lit like a knife's edge, so I don't scratch the mask. I tried with an old credid card, but I need something stronger than that. Something like this:
https://www.google.com/url?sa=i&rct...aw3fjOftuPR2vQNpmMx0iUt-&ust=1535570149767276
https://www.google.com/url?sa=i&rct...aw3fjOftuPR2vQNpmMx0iUt-&ust=1535570149767276
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