Hi! Im not such a ninja in scripting, but I managed to make this! Thanks a lot to my friend Vadim who help me to fathom some things in max script!
1) This script remove useless polygons enshrouded by other geometry.
2) No unwanted geometry will be generated, just removing precisely mesh-interior faces of selected editable poly object.
3) It's hardcoded so pretty slow, sorry for that.
4) no multiple objects allowed yet
5) all opened parts will be preserved to avoid any bugs