powershell remove all permissions on a folder for a specific user

Question

I need a script or simple powershell code for removing all permissions to a folder for specific user, by inheriting these deletion to all the subfolders and files as well -

Answer 1

 $acl=get-acl c:\temp
 $accessrule = New-Object system.security.AccessControl.FileSystemAccessRule("domain\user","Read",,,"Allow")
 $acl.RemoveAccessRuleAll($accessrule)
 Set-Acl -Path "c:\temp" -AclObject $acl

this should wipe all security rules for user in c:\temp recursively