Remove old MP from MPList

Hi All,

Can anyone tell me how to remove my decommissioned MP from my MPList when running:

http://mp/sms_mp/.sms_aut?mplist

It still returns my old MP that was decommissioned weeks ago.  I think this may have something to do with my clients not staying connected and active in the SCCM admin console.

<MPList>
  <MP Name="US-SCCM.mycompany.COM" FQDN="US-SCCM.mycompany.com">
    <Version>9106</Version>
    <Capabilities SchemaVersion="1.0">
    <Property Name="SSLState" Value="0"/>
    </Capabilities>
  </MP>
<MP Name="US-SCCM2.mycompany.COM" FQDN="us-sccm2.mycompany.com">
  <Version>9106</Version>
  <Capabilities SchemaVersion="1.0">
  <Property Name="SSLState" Value="0"/>
  </Capabilities>
</MP>
</MPList>

Many thanks in advance!

AJ