andreyv [1] filed a deletion request for svn-clean [2]: Since Subversion 1.9 this functionality is built-in: "svn cleanup --remove-unversioned --remove-ignored --include-externals".
[1] https://aur.archlinux.org/account/andreyv/ [2] https://aur.archlinux.org/pkgbase/svn-clean/
