Remove-SPODeletedSite using PowerShell in SharePoint

The Remove-SPODeletedSite cmdlet permanently removes a SharePoint Online deleted site collection from the Recycle Bin.You have to be a SharePoint Online global administrator and site collection administrator permissions to run the cmdlet.
 
Syntax
  1. Remove-SPODeletedSite [-Identity] <SpoSitePipeBind> [-Confirm [<SwitchParameter>]] [-WhatIf [<SwitchParameter>]]    
Example
  1. Remove-SPODeletedSite -Identity https://gauti.sharepoint.com/sites/sitetoremove