Deleting cross domain users from groups

I have a group of groups that I am trying to delete all of the users from. It happens that some of the users are in other domains than that of the groups. I have tried both the MS and the Quest versions of Remove-ADGroupMember. I have also read many posts but have yet to find someone who has actually been able to make it work.

It appears to me that the Remove-ADGroupMember function will only recognize users in the default domain. Has anyone been able to find a way around this?

Thanks. SB