Update AD Custom ExtensionAttributes or Remove

Used this script at a customer environment to remove AD ExtensionAttributes, also you can use Add, Replace or Clear

get-aduser -properties extensionattribute1 -searchbase “OU=USERS,DC=local,DC=lan” -filter * | Where {$_.extensionattribute1 -eq “ANYTEXT” } |  % { Set-Aduser -identity $_ -Remove @{extensionattribute1=@(“ANYTEXT”)}}

Credits:
https://github.com/Seidlm/Active-Directory/blob/main/Update%20Active%20Directory%20User%20Properties.ps1