如何使用msdeploy或msbuild在发布之前删除文件？

I am using msdeploy to publish on a remote server via teamcity. Problem is msdeploy doesn't delete files in IIS site directory prior to publish. Can any one tell how to delete file prior to publish using msdeploy or do I have to write a batch script to delete directory and then recreate it?I am using msdeploy to publish on a remote serv