http://www.broobles.com/blog/posts/36
Everything below is a direct copy and paste of the link above... but I don't want to take the risk, should that link ever go down...
In Windows Explorer:
Right click on the folder and click Search.. Enter .svn as the filename to search for. Click “More advanced options” and select: - Search hidden files and folders - Search subfolders Press search button and delete the folders you find appropriate.
Oh, and this description is at least valid for windows xp pro.
The easiest way is by creating a .cmd script file at the root directory and execute it. Here is the code for cleanSVN.cmd :
for /f “tokens=* delims=” %%i in (’dir /s /b /a:d *svn’) do ( rd /s /q “%%i” )
svn export folder1 tempfolder
deltree folder1
mv tempfolder folder1