How do I use Get-ADUser to get just the Managers attribute? And then get rid of duplicates in my array/hash table?

Hello,

      I am trying to just get the Managers of my users in Active Directory. I have gotten it down to the user and their manager, but I don't need the user. Here is my code so far:

Get-ADUser-filter*-searchbase"OU=REDACTED, OU=Enterprise Users, DC=REDACTED, DC=REDACTED"-PropertiesManager|SelectName,@{N='Manager';E={(Get-ADUser$_.Manager).Name}}|export-csvc:\managers.csv-append 

Also, I need to get rid of the duplicate values in my hash table. I tried playing around with -sort unique, but couldn't find a place it would work. Any help would be awesome.

Thanks,

Matt