Quote - I wondered if there is a python for P7 to remove all the unused textures from the scene file.. I do NOT want to start over from scratch...

Poser does not save textures to a pz3 (scene) file or to any other library file. What it does save are texture references. That is to say, paths pointing to where the texture files are to be found.

I suggest that the first thing you should try is to close Poser. Restart Poser and load your scene, this may have cleared the unwanted textures. If not, you may have to open the pz3 in a text editor or cr2 editor and edit out the texture references. Replace any unwanted texture reference with "NO_MAP" (without the quote marks). Perhaps there is a py script that will do it for you, but I don't know of any.