This has been a gripe of mine since Poser 5.  The only way I have found is to save the new scene, close it and open it again.  Most of the time this cleans out the old textures but not always.

I was hoping, when SM bought Poser, they'd come up with something new for this problem.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.