Delete all in model materials in bulk - all at once

[darkzoe]

Is there a method to delete all "In Model" materials at once, without clicking on every material? My model is empty anyway.

This is because I want to create several new material colletions. The way I know how to do it (import textures into SU and explode and "Save collection as...") requires cleaning "In Model" every time - otherwise each collection will contain materials from earlier collections. So before starting clicking hundreds of times to delete one by one, I want to make sure there is no other way.

[massimo]

You can use, for example, the Remove all materials plugin and then do "purge unused" materials.