Is there anyway to delete clones that are local variables?

Is it possible to do this?

 void Thrust()
 {
     if (Input.GetKeyDown("w"))
     {

         GameObject Temporary_Emitter_Handler;
         Temporary_Emitter_Handler = Instantiate(Thruster, Thruster_Emitter.transform.position, 
         Thruster_Emitter.transform.rotation) as GameObject;
         Temporary_Emitter_Handler.transform.parent = transform;

         GameObject Temporary_Emitter_Handler2;
         Temporary_Emitter_Handler2 = Instantiate(Thruster, Thruster_Emitter2.transform.position, 
         Thruster_Emitter2.transform.rotation) as GameObject;
         Temporary_Emitter_Handler2.transform.parent = transform;

         GameObject Temporary_Emitter_Handler3;
         Temporary_Emitter_Handler3 = Instantiate(Thruster, Thruster_Emitter2.transform.position, 
         Thruster_Emitter2.transform.rotation) as GameObject;
         Temporary_Emitter_Handler3.transform.parent = transform;

         Temporary_Emitter_Handler.transform.Rotate(Vector3.left * 195);
         Temporary_Emitter_Handler2.transform.Rotate(Vector3.left * 195);
         Temporary_Emitter_Handler3.transform.Rotate(Vector3.left * 195);
     }
     else (Input.GetKeyUp("w"))
     { 
             Destroy(Temporary_Emitter_Handler);
             Destroy(Temporary_Emitter_Handler2);
             Destroy(Temporary_Emitter_Handler3);
     }
 }

}

I want the clones the script created to be destroyed after i release the "w" key. The Script itself works but after "else" it says i can't refer to the clones because the clone are a local variable. So is there any way to do this? (I didn't know what to put as a title, sorry if it's misleading)