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The process for deleting a service instance in Angular goes as follows:

1. Identify the service instance that you want to delete.

2. Inject the service into the component or module where you want to delete it.

3. Call the "unsubscribe" method of the service instance to stop any ongoing subscriptions.

4. Set the service instance to null to remove any references to it.

5. If the service is a singleton service, remove it from the providers array in the app.module.ts file.

6. If the service is not a singleton service, remove any references to it in the component or module where it was injected.

7. Save your changes and test to ensure that the service has been successfully deleted.