(Help) I need this script to destroy all game objects in a scene.

Hello,
I am trying to make the following script destroy all the balloon clones in the scene but it is not working.
If I use the line Destroy(Balloons) it gives me the error Destroying Assets is not permitted to avoid data loss.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;

public class WipeOut : MonoBehaviour
{
    //public GameObject WipeOutCounterInternal;
    NumOfWipeOutsCounter WipeOutCounterInternal;
    public GameObject WipeOutPrefab;
    public GameObject Balloons;
    bool allowWipeOut = false;
    public NumOfWipeOutsCounter numOfWipeOutsCounter;
    GameObject temp;

    // Start is called before the first frame update
    void Start()
    {
        numOfWipeOutsCounter = WipeOutCounterInternal.GetComponent<NumOfWipeOutsCounter>();
        temp = GameObject.Find("Balloons" + "(Clone)");
    }

    // Update is called once per frame
    void Update()
    {
        if (numOfWipeOutsCounter.WipeOuts >= 0)
        {
            allowWipeOut = true;
        }

        if (allowWipeOut = true && Input.GetKeyDown("space"))
        {
            Instantiate(WipeOutPrefab);
            numOfWipeOutsCounter.WipeOuts--;
            Destroy(temp);

            if(numOfWipeOutsCounter.WipeOuts == 0)
            {
                allowWipeOut = false;
                numOfWipeOutsCounter.WipeOuts = 0;
            }
        }
    }
}

Many thanks,
Josh Keedy.

Hello.

First, this line is not correct:

temp = GameObject.Find("Balloons" + "(Clone)");

you forget the space, it should be with a space betweeen baloons and (Clone)

temp = GameObject.Find(“Balloons” + " (Clone)");