Git creates one .git folder in the root of a project. SVN creates a .svn/_svn folder in every single folder of it's project. This script cleans out the ( _svn | .svn ) folders left behind by subversion, it's useful when you don't already have an automated release process in place to do this and you quickly need to clean pu a checked out repo for a client/release.
Use this at your own risk.