Free, nothing to install
Does it come back?
Paste a folder from your Mac and see whether it comes back if you delete it, and why. These are the same notes the SiftMac app uses, run right here in your browser. The path isn’t sent anywhere.
In Finder, hold Option, right-click a folder and choose Copy as Pathname, then paste it here.
Try
These are SiftMac’s own notes: the places it knows by path and the folder names it knows anywhere, the same ones the app shows in its space map. On your Mac, the app adds what a web page can’t know: sizes, what’s in use right now, and the 7-day Undo Shelf for anything that can’t come back.
Download SiftMac
Scanning is free, and so is your first 2 GB of cleaning.