```batchfile
@echo off
pushd "%~dp0"
for %%i in (Debug Release) do "%SystemRoot%\Microsoft.NET\Framework\v4.0.30319\msbuild" /target:Clean /p:Configuration=%%i src\NCrontab.sln
popd
```

Clean script can simply delegate to build script
user
```batchfile
@"%~dp0build" /v:n /target:Clean
```
assistant