Clearing obsolete Computer System.Models from Device Collection values

Does anyone know how to remove old Device Models from MECM?  All of these devices have been deleted from SCCM and AD and we now have lots of devices available in our drop down list when creating a Device Collection based on Model Type.  Not a huge deal, it's really for house keeping.

For those who are unsure what I am talking about, Create a New Device Collection and under Membership Rules create a Query Rule, then Edit Query Statement, then Add a new 'Criteria;, select Computer System then Model then click the Value button and you will see a list of all Device Models MECM has enumerated for your fleet.

We have around 110 different devices listed and I would like to delete all of the items that we no longer have.  Seems like a simple feature that should be in an obvious place.