Restore cancel cleanup message

today I reinstalled Q4.1, then connected USB drive to restore, long wait, the progress line finished but nothing was happening, so I hit cancel, long wait, finally closed the window, a message popped up, that I would need to “clean” something as the restore /cancel was only partially done; now I’m wondering where is the directory I’m supposed to clean, and if the restored AppVMs might somehow be broken, though so far I detect nothing…? re: security , grexec or elsewise