Try this out: Select your objects and run the script. It will condense the material editor for any unused materials and remove textures from any material in the scene. It doesn't work on every type of material but it should work on basic ones or even subobject ones. I haven't properly tested it but it should work ok.…
Does this exist? Did a quick script spot search w/ no luck. I've got a bunch of textures being referenced in my scene, but none are visible in my mat editor. Short from eye dropper picking each object... i've got no way to clean em out!