How to get rid of extra materials in single object

In a complex object I separated one part, but material list shows every material in scene. Is there a way to automatically get rid of unused materials from object or material list?

How do I check what material is being used in that specific object (ideally without having to use select assigned, as I have several materials showing)?

In the dropdown next to the material slots, click the ‘remove unused slots’ operator:

Perfect, thanks a lot!

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