Revert SVN import

Instead of importing a project/folder as

svn import vlsms/ file:///home/repo/vlsms -m "Initial Upload"

I did

svn import vlsms/ file:///home/repo -m "Initial Upload"

How to undo this import (in a clean way,without trace?)

---------- Post updated at 03:10 AM ---------- Previous update was at 02:34 AM ----------

I think i did it

last import(vlsms) was revision 22

svnadmin dump /home/repo/ --revision 0:21 > src.db
su
mv /home/repo /home/repobk
mkdir /home/repo
chown :svn /home/repo
exit
svnadmin create /home/repo
svnadmin load /home/repo < src.db