Question Project clogged with temp materials from imported animations

Hi folks,
I've used some animation packs from the asset store and they always include some demo controller/model(s)/etc which can usually be easily deleted. The problem is that they also usually include sometimes hundreds of duplicate materials that are worthless and clog the list whenever you're trying to select actual materials you are trying to find.

Is there a tool or command to remove these? I'm guessing there is no way to handle this without all the animation asset vendors doing exports w/o the janky materials but I hope I'm wrong.

Thanks!