How to Delete Unused (Orphaned) Service Application App Pool in SharePoint 2010?

When you delete the Service applications, their Application Pools will not get deleted – They’ll become orphan/unused. So later when you create a new service application with same application pool, SharePoint will throw an error message: Application pool is already in use! “An object of the type Microsoft.SharePoint.Administration.SPIisWebServiceApplicationPool named “Excel Service Application…

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