[CentOS] how to clean YUM download?

yum clean all
mcclnx mcc schrieb:
> We have CENTOS 5.2 on DELL server.  While I run "yum update" and yum start download files.  in middle of download there have power surge and computer reboot.  
> 
> Does there has way to clean yum download?
> 
> Thanks
> 
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