Open Scheduling and Cleanup → History to get an overview of completed cleanup jobs, both scheduled and manual.
To view logs of only scheduled cleanups select the Scheduled Cleanups tab, then See logs.
Similarly, to see only logs of manual cleanups select the Manual cleanup tab, then Show logs.
Download
Download/Download all will create .json files with cleanup log data of a specific cleanup or respectively all cleanups in the view.
Show users
Select Show users to view which users were cleaned or marked for review in the selected cleanup job.