Update TROUBLESHOOTING.md

docs/TROUBLESHOOTING.md

@@ -8,6 +8,14 @@ If your **deployment fails and the resource group has been created**; an IT admi
 
 If your deployment has an error look [here](https://docs.microsoft.com/azure/azure-resource-manager/templates/common-deployment-errors?WT.mc_id=learnlti-github-cxa) for common errors.
 
+## Failed deployment or removing the services 
+
+To remove the services simply run the [cleanup.bat](https://github.com/microsoft/Learn-LTI/blob/main/deployment/cleanup.bat) script located in the Deployment folder. This will run the [Cleanup.ps1](https://github.com/microsoft/Learn-LTI/blob/main/deployment/Cleanup.ps1) script which will remove all the deployed resources for the Learn LTI Application from your Azure Subscription. 
+
+To Manually remove resources simply remove the Microsoft Learn LTI resource groups  
+- ResourceGroupName = "MSLearnLTI"
+- AppName = "MS-Learn-Lti-Tool-App"
+
 ## Check the Failed Deployment status and output
 
 From the Azure Portal, simply select deployments. See the following screenshot.