One of these days when I get a round-tuit I'm gonna try this: Take some paper and make a rubbing of the hatch and then temporarily glue it to some soda pop plastic bottle or aluminum can and cut the pattern out. Sorry no help unsticking the glued PE but maybe a way to reproduce it.
I tried nail polish remover (acetone). I soaked the intended part once yesterday, and again this morning. I then took an exacto and it slipped right under the part and it lifted off clean. For those who need to do that, this works.
SCM #653 SubCommittee Vice President 2006-2008 Author-Russian Submarines, Guardians of the Motherland Member-Saint Petersburg Russia Submarine Club