Prefab clones aren't deleting?

I have prefabs for a chat log that should be deleted once the dialogue box closes. Although they are removed from the chat log, they are not actually deleted and take up space within the chat log when the dialogue box opens. I do not know what I am doing wrong. Any help is appreciated. Here is my code:

 //Toggle dialogue box:
     void ToggleDialogueBox()
     {
         if (!dialogueBox.gameObject.activeSelf && Input.GetKeyDown(KeyCode.T))
         {
             dialogueBox.gameObject.SetActive(true);
             textIndex = 0;
             choiceNum = 0;
             skipping = false;
             dialogueScript.Clear();
             prefabList.Clear();
         }
         else if (dialogueScript.Count == textIndex)
         {
             StopAllCoroutines();
             foreach (TextMeshProUGUI item in prefabList)
             {
                 Destroy(item);
             }
             dialogueBox.gameObject.SetActive(false);
         }
     }
 
 //Makes a list of prefabs:
     void WriteToLog(string name, string text)
     {
         if (name == null)
         {
             prefab.text = text;
         }
         else
         {
             prefab.text = name + ": " + text;
         }
         
         TextMeshProUGUI clone = Instantiate(prefab, content);
         prefabList.Add(clone);
     }