To recursively delete all .svn folders below a given path follow these instructions:
Linux
Run this command:
#rm -rf `find . -type d -name .svn`
Or:
# find . -type d -name .svn | xargs rm
Windows
1. Open up command prompt
2. Browse to the parent folder (.svn folders exist below your parent folder)
3. Copy and paste this in to command prompt:
for /f "usebackq" %d in (`"dir *.svn /ad/b/s"`) do rd /s/q "%d"
4. Hit enter and be amazed!
Source: http://cavemansblog.wordpress.com/tag/recursively-delete-svn-folder/
recursively delete .svn folder