For convenience I've written a batch file that closes OneDrive before loading CCleaner so when I do a clean "Applications - Microsoft OneDrive" without a warning (and having to re-run the clean). Often CCleaner reports that it has removed hundreds of files, amounting to megabytes of space for OneDrive.
I would like to know exactly what files this is actually cleaning up and what is/are the path/s to these files.
Perhaps try opening CCleaner, click on the Applications tab at the top, then right-click on the word Microsoft One Drive and select Analyze and if there is anything there, double click on it to get a list.
This is under Custom Clean and One Drive must be ticked to see the list.