Material Slots Cleaner addon for Blender 2.8+
Remove unused material slots from all selected meshes at once in Blender
This simple addon checks each selected mesh and removes unused material slots that could have been still attached to your meshes. I found it pretty useful in cases were you have to separate an imported fbx into different pieces.
By default all the newly created meshes will inherit all the applied materials of the original fbx, even if the single mesh does not use all of them. With MatSlotCleaner, instead of having to go through each mesh and remove unused slots, you can do it with just one click.
Keep in mind that this addon is not deleting unused materials from your blend file (you can easily already do that in default Blender), but it's cleaning the material slots instead.
Why MatSlotCleaner is not free anymore?
1) In order to download the addon I ask you for a small tip in order to further support the development of even more tools like this one.
2) In order to match the net price of the same addon on BlenderMarket
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