# log files
find vbmnt/var/log -type f -delete
# apt lists
-find vbmnt/var/lib/apt -type f -name '*debian*' -o -type f -name '*list*' -delete
+find vbmnt/var/lib/apt -type f -name '*debian*' -o -type f -name '*list*' | xargs -r rm
# user data
# cannot clean all root stuff, because it also contains useful thing (e.g. git setup)
rm -f vbmnt/root/.*history