Clean material slots that are not used. — Right-Click Select
rendering - How to delete unwanted material? - Blender Stack Exchange
Material Slots Cleaner addon for Blender 2.8+
Blender 3.00, we still don't have an option to delete materials/actions with a simple x - Basics & Interface - Blender Artists Community
edit mode - How to clean up a project - remove unused materials - Blender Stack Exchange
How to delete your unused materials in Blender 2.8? | DESIGN SYNC
How to delete unused materials in Blender - cgian.com
How to delete all unused materials from a Blender 2.8 file, time saving tips for beginners - BlenderNation
texturing - How to remove unused textures and materials - Blender Stack Exchange
Can't delete unused materials : r/blenderhelp
How can I remove all unused materials from a .blend file? - Blender Stack Exchange
Blender – quickly clearing multi-materials – Oded Maoz Erell's CG Log
How To Delete a Material in Blender - Artisticrender.com
Is there a way to permanently remove unused materials created? (Easier and cleaner material organization) — Right-Click Select
Vray addon: Delete unused materials and material nodetrees - Chaos Forums
Clean material slots that are not used. — Right-Click Select
Remove Unused Materials - Blender 2.8x Addon - YouTube
How do I delete Materials? - Basics & Interface - Blender Artists Community
deleting unused materials and textures - Basics & Interface - Blender Artists Community
image - Delete all unused textures from Blender using Python - Blender Stack Exchange
4) How to delete all unused materials from a Blender 2.8 file, the best time-saving tips - YouTube | Blender, Blender tutorial, Saving tips
GitHub - NazzarenoGiannelli/matslotcleaner: Remove unused material slots from all selected meshes at once in Blender 2.8+
How to delete unused materials in Blender? - YouTube
