Delete Unused Assets + Materials?

Is there an easy way to clean up the project file by letting Unreal know:
Hey, remove all assets, texture maps, materials, etc. that are NOT being used in the actual scene?

thanks for any little help!

I don’t think there is, but would also want to know if there was…
I have been using the reference tree to axe stuff with less problems.

Go to Content Browser -> Filters -> Other Filters -> Not used in any level