How to empty CustomAttribute fields using Power Shell?

I need to empty the value in CustomAttribute1 and CustomAttribute2 for some Exchange 2013 mailboxes. Can you help please?
Dell AdminAsked:
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Jacob DurhamIT Support Analyst II (Lead Infrastructure Engineer)Commented:
Get-Mailbox -Identity mailbox1 | Set-Mailbox -CustomAttribute1 "<not set>"  -CustomerAttribute2 "<not set>"

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Returns the entry to the default < not set > .. dont forget the quotes as < & > are "reserved for future use."
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Dell AdminAuthor Commented:
Thanks Jacob.

I need to see who are not empty on those fields first. I found the following two commands give different result:
Get-Mailbox -Filter {CustomAttribute1 -ne $null} | select Name, CustomAttribute1, CustomAttribue2
Get-Mailbox | ? CustomAttribute1 -ne $null | select Name, CustomAttribute1, CustomAttribue2

Aren't they supposed to give the same result?
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Jacob DurhamIT Support Analyst II (Lead Infrastructure Engineer)Commented:
Empty

get-mailbox -ResultSize unlimited | Where-Object CustomAttribute1 -like $null

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NotEmpty
get-mailbox -ResultSize unlimited | Where-Object CustomAttribute1 -notlike $null

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