SCCM obsolete uknown computers - abortpxe problem

Recently I tested Windows To Go on some computers which already has SCCM clients installed. It leads me to abortpxe problem - I cannot reimage laptop even if I removed device from SCCM. I search just by name but when using Windows To Go it share the same MAC address as physical computer on which it is running - so this generates for me some unknown or obsolete computers objects. I managed it by creating new collections based on below query

select SMS_R_SYSTEM.ResourceID,SMS_R_SYSTEM.ResourceType,SMS_R_SYSTEM.Name,SMS_R_SYSTEM.SMSUniqueIdentifier,SMS_R_SYSTEM.ResourceDomainORWorkgroup,SMS_R_SYSTEM.Client from SMS_R_System where obsolete = 1

Then remove what You need