"Other" items filling umps internal SSD
My 2018 Mac Mini running 10.15.2 has a APFS formatted 250GB internal SSD. Using both the Finder and "About This Mac" I have just found out that it has only 3.22GB of free space. 170GB of the used space is by something called "Other" "Other" seems to be a form of Dark matter it occupies space but cannot be seen. I could just reformat and install from a backup, but this seems almost prehistoric. Does anyone have a better solution?
Thanks
Mac mini 2018 or later