Check if a Windows service exists and delete in PowerShell

You can use WMI or other tools for this since there is no Remove-Service cmdlet until Powershell 6.0 (See Remove-Service doc)

For example:

$service = Get-WmiObject -Class Win32_Service -Filter "Name="servicename""
$service.delete()

Or with the sc.exe tool:

sc.exe delete ServiceName

Finally, if you do have access to PowerShell 6.0:

Remove-Service -Name ServiceName