Cleaning out unmanaged detector list

Hello,

   I've "inheritied" our SEPM 12.1 environment when I started at this company, and now I'm trying to "reverse engineer" it's setup.

   I've set up a managed detector and it seems to work fine - for what it is.  I understand that it's not perfect, and that's OK.

   But it seems to still bringing up 2 machines that I KNOW have SEPM installed.

   So, is there a way to clear out what the unmanaged detector is sending to the SEPM?  Or is this list on the SEPM server and i need to do something there?