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  • $\begingroup$ Wow! Cool! Your 3 line script solved the problem! Now the clean up found every unused stuffs, the file size dropped from 11 MB to 3 MB and the inner structure is nice clean, not a huge trash can. I don't understand, why isn't this part of the default clean up function. I will create a menu item from this script. $\endgroup$ Commented Aug 13, 2021 at 15:47
  • $\begingroup$ THanks. Added an edit to explain somewhat. $\endgroup$ Commented Aug 13, 2021 at 16:26
  • $\begingroup$ I don't think Blender should rely on third party addon developers. There are a lot of addon with many-many bugs, the most addon developer is not even professional coder, or has not enough knowledge of Blender API. So Blender has to provide a robust framework, and if user want to clean everything that is not effect the actual scene, it shoud delete it mercylessly. Or ask user, what to do if pointers found referenced to unknown sources. $\endgroup$ Commented Aug 13, 2021 at 17:00