prune of
prune (something) of (something else)
To make something more trim, clean, or neat by pruning away that which is superfluous, undesirable, or unnecessary. I want to prune the tree outside of its dead and overgrown branches. As your career evolves, you'll need to start pruning your résumé of less relevant work experience.
prune something of something
to clear, clean, or groom something of something by pruning. Sally was out in the orchard pruning the apple trees of dead branches. They pruned the roses of their unneeded branches.