brew cleanup -s ==> This operation has freed approximately 2.4G of disk space.
rm -rf $(brew --cache)
$ brew cleanup -h brew cleanup [--prune=days] [--dry-run] [-s] [formulae]: For all installed or specific formulae, remove any older versions from the cellar. In addition, old downloads from the Homebrew download-cache are deleted. If --prune=days is specified, remove all cache files older than days. If --dry-run or -n is passed, show what would be removed, but do not actually remove anything. If -s is passed, scrub the cache, removing downloads for even the latest versions of formulae. Note downloads for any installed formulae will still not be deleted. If you want to delete those too: rm -rf $(brew --cache)