• I haven't implemented this personally, but found this github repository when I Binged for your question. Hope this helps you or at least directs you in the correct direction.
    https://github.com/philskents/pjspowershell/blob/master/azure/Remove-OldAzureStorageBlob.ps1
    https://strangeadventures.in/deletingoldfilesfromazureblobstorage/