Added 1k+ items to library; need to mass delete.

Short version of a long story is that I added like 3,000 color swatches to my library, and I need to know how to mass delete items from said library. I contacted support, and they couldn't even grasp what I was asking about, so obviously they were zero assistance. Is there a way to select a group of items and delete them all at once? So far, I've only been able to select them one at a time and individually delete each one, which will take an actual eternity to remove all 3k. I meant to add them to the color swatch library, instead, I added them to the main library where all of my project's parts and pieces are stored. Help!