When i try to add Collider2D or Rigidbody2D through code to prefab gameObject after stopping game the added component remain added to the prefab obejct.

How i want it when i run game collider or rigidbody component should get added to prefab object when it stop it should added component should be not there.

     public class Tower : MonoBehaviour
    { 

    TowerHouse _towerInstance;
     public void  Start() 
    { 
          AddTower();
     }
     public void AddTower()
     {
        TowerHouse _towerHouse;

        GameObject builder_UpDownwall =(GameObject)Resources.Load("Prefabs/Structure/BuilderUpDownWall", typeof(GameObject));
      
       if (builder_UpDownwall .GetComponents<Rigidbody2D>().Length >= 1)
          {
         DestroyImmediate(builder_UpDownwall .GetComponent<Rigidbody2D>(), true);
         builder_UpDownwall .AddComponent<Rigidbody2D>().isKinematic = true;
          }
        else
          {
         builder_UpDownwall .AddComponent<Rigidbody2D>().isKinematic = true;
          }
                   _towerHouse = builder_UpDownwall.GetComponent<TowerHouse>();
                 _towerHouse.GetComponent<SpriteRenderer>().sortingOrder = 1;
                 _towerInstance = Instantiate(_towerHouse, new Vector3(transform.position.x, 
                  transform.position.y, transform.position.z), _towerHouse.transform.rotation);
      }

      }