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    $\begingroup$ How to unlink materials? Is it right-clicking them in the outliner and pressing "unlink" as shown in blender.stackexchange.com/questions/2362/… ? If yes, this seems to not be enough. I have lots of unused materials in my list after reloading. $\endgroup$ Commented May 15, 2018 at 10:21
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    $\begingroup$ The fastest way (for me, at least), is from the material datablock in the Properties Editor. Shift+click the X on the datablock widget and it should unlink that material from everything in your .blend file. $\endgroup$ Commented May 15, 2018 at 11:49
  • $\begingroup$ This is not a systematic way of solving the issue. In some cases, it might not be a good idea to close and open the .blend file especially if you have lots of back-up materials and other data blocks that you keep assigning to your objects and render them because the unlinked materials will also get lost once you re-open the file. Redefining the materials and all other unlinked stuff will be computationally expensive as well. So the easiest way is to remove the materials using this Python script after you unlink the unwanted ones. $\endgroup$ Commented Oct 26, 2018 at 13:48
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    $\begingroup$ @Amir, There are multiple solutions to many problems (as shown in the responses to this question) and there are certainly different situations where one solution is more beneficial than another. We simply disagree on what constitutes as "easiest". $\endgroup$ Commented Oct 30, 2018 at 12:20
  • $\begingroup$ I found that SHIFT + CLICK on all unwated textures, then save, then reload did the trick for me. Simply unlinking always left some remains. $\endgroup$ Commented Mar 28, 2019 at 21:52