If you’re talking about the Storage Sense feature - it sucks. It only clears a handful of well-known locations, but it doesn’t touch any of the orphaned content in C:\Windows\Installer, or the CSC or the old Panther folders from upgrades, not to mention several other files and folders in AppData. As I’ve said before, I’ve been a Windows sysadmin (until last year infact) managing over 20,000 devices, we’ve had Storage Sense on, but it’s been mostly useless - to the point that I ended up writing own cleanup script and set it to run before we pushed out a new Windows feature update, because otherwise we’d get several devices which failed to update due to the disk being full.