destroy prefabs

public class Manager : MonoBehaviour {

void Update(){ if (selectedlevel == 2 && ini == false && Play_Button.reached == true) { if(AgainButtonPress.again==true) { Debug.Log("again button is pressed"); // Destroy(clone, 2f); TapTile.wrongchoice=false; Destroy (clone.gameObject);

             AgainButtonPress.again=false;
         }
         //Destroy(Instantiate(mul2, new Vector3 (0, 2, -10), Quaternion.identity));

                             clone = (GameObject)Instantiate (mul2, new Vector3 (0, 2, -10), Quaternion.identity);
         //Instantiate (mul2, new Vector3 (0, 2, -10), Quaternion.identity);
         //Destroy(mul2);
                             ini = true;
                         //    buttonpressed = false;
                     } }

}

public class AgainButtonPress : MonoBehaviour { public GameObject camera; public static bool again=false;

 void OnMouseEnter()
 {

 }
 void OnMouseDown()
 {
 

// transform.animation.Play ("ButtonPress"); camera.transform.position=new Vector3(0,4,-10); Manager.selectedlevel = 2; Manager.buttonpressed = true; Manager.ini=false; again = true;

     //Destroy( GameObject.Find( "multiple2" ), 3 );


     //Destroy(GameObject.FindWithTag("Untagged"));

 }

i want to destroy the game object when the again button is pressed then instantiate the game object once again..At first the game object is instantiated perfectly but after the again button is pressed the game object is not destroyed..