ResourceTarget Purging

Hello,

we are using CMS 7.1. If we create Managed Software Delivery (MSD) and apply it to some filter - resourceTarget is created (in XML view of this MSD task I see only resourceTarget GUID to which it is pointed, not the GUID of filter itself). After delete of MSD the resourceTarget item still remains in table Item (and other tables) in database.

My question is if these ResourceTarget rows are deleted from the table sometime?