Take Win 10 as an example, open the file explorer in the taskbar, right-click "local disk (c)", and click "Properties" in the pop-up right-click menu to pop up a new window with "disk cleaning". After the main scan, a new window pops up, "cleaning system files". This is the standard way to clean up disk garbage.

There are some manual cleaning methods circulating on the Internet, which are not very reliable. Maybe we should reinstall the system. In the final analysis, the lack of space on disk C is due to insufficient capacity allocated to the system disk. In the era of Windows 10, it is generally recommended to allocate 100GB to the system disk (C disk). Microsoft Sophie Computer has recommended single partition by default (commonly known as "no partition").