When you invalidate the cache, CLion removes the cache files for all project even run in the current version of the IDE. The files will be recreated the next time you open these projects.
Note the following before you proceed:
The caches will not be deleted until you restart CLion.
Opening and closing a project without invalidating the cache does not result in deleting any files.
Local History is not deleted when you invalidate the cache unless you explicitly enable this option in the Invalidate Caches dialog. However, mind that Local History has a retention period of 5 working days by default.
Clear the system cache
Callfrom the main menu.
Select Clear file system cache and Local History to remove the virtual file system cache together with the information stored in Local History.
This might be helpful for troubleshooting purposes when usual cache invalidation is not enough.
Click Invalidate and Restart.
If you click Just restart, cache files won't be deleted, and the selected optional action won't be applied.
For details on where various user-specific files are stored, see Default IDE directories.