Most developers know about the big offenders — Xcode's DerivedData, Docker images, node_modules . But there's a second tier of caches that almost nobody thinks about: Homebrew downloads, Gradle wrapper distributions, Maven repositories, Go module caches, Ruby gems, and IDE workspace storage. None of these is massive on its own. Homebrew might be 3GB. Gradle caches, 8GB. Your IDE's workspace storage, another 4GB. But stack five or six of these together and you're looking at 20-40GB of disk space consumed by files you'll never open, never reference, and never miss if they're gone. I built MegaCleaner specifically because I kept rediscovering these folders every few months, manually cleaning them, and then forgetting about them again. This article covers every location, every cleanup command, and the typical savings you can expect. 1. Homebrew Cache Homebrew is installed on nearly every developer Mac, and it quietly caches every package it downloads. Upgrade a formula? The old tarball stays.…