Remove-MSDeploymentUnits
Remove (delete) a list of Deployment Units. Use the -UnDelete switch to Undelete instead. When a Deployment Unit is Deleted it is moved to a Delete queue to be deleted at a later date. Deleting these Deployment Units again with the -AllowRealDelete will truly delete them from MS.
Syntax
Remove-MSDeploymentUnits -DeployUnitIds (Int32[]) [-BatchSize (Int32)] [-AllowRealDelete] [-UnDelete]