save the following content in clearsvn.bat and save it in root dir.

@echo on

color 2f

mode con: cols=80 lines=25

@REM

@echo Deleting all .svn, please wait......

@rem Delete .svn in current and sub directories

@rem for /r . %%a in (.) do @if exist "%%a\.svn" @echo "%%a\.svn"

@for /r . %%a in (.) do @if exist "%%a\.svn" rd /s /q "%%a\.svn"

@echo SUCCESS!!!

@pause