Destroy TextMesh from generate objects

Hi, I would like to know how can I destroy a textmesh in objects generates for example a have
prefabricated a block with a textMesh, and I generate news with a class, but I only can destroys current blocks in my logic class, how can I destroy the befores textmesh??

This is my blocks generator class

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class GeneratorLogic : MonoBehaviour
6. {
7.  
8.     private string displayText;
9.     private TextMesh testMesh;
10.     public GameObject[] blocks;
11.  
12.     // Start is called before the first frame update
13.     void Start()
14.     {
15.         NewBlock();
16.     }
17.  
18.     // Update is called once per frame
19.     void Update()
20.     {
21.  
22.     }
23.  
24.     public void NewBlock()
25.     {
26.         Instantiate(blocks[Random.Range(0, blocks.Length)], transform.position, Quaternion.identity);
27.     }
28.  
29. }

and this is my logic class

And each time This program generates new blocks with textmesh, and I only can destroy the current block how can I destroy the befores generates blocks

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

using Mono.Data.Sqlite;
using System.Data;
using System.Linq;

public class BlocksLogic : MonoBehaviour
{
//
private string displayText;
private TextMesh testMesh;
//

private float tiempoAnterior;
public float tiempoCaida = 0.8f;

public static int alto = 15;
public static int ancho = 9;

public Vector3 puntoRotation;

private static Transform[,] grid = new Transform[ancho, alto];

//
int var_random;
//

// Start is called before the first frame update
void Start()
{
}

// Update is called once per frame
void Update()
{

if (Input.GetKeyDown(KeyCode.LeftArrow))
{
transform.position += new Vector3(-3, 0, 0);
if (!Limites())
{
transform.position -= new Vector3(-3, 0, 0);
}
}

if (Input.GetKeyDown(KeyCode.RightArrow))
{
transform.position += new Vector3(3, 0, 0);
if (!Limites())
{
transform.position -= new Vector3(3, 0, 0);
}
}

if (Time.time - tiempoAnterior > (Input.GetKey(KeyCode.DownArrow) ? tiempoCaida / 20 : tiempoCaida))
{
transform.position += new Vector3(0, -1, 0);
if (!Limites())
{
transform.position -= new Vector3(0, -1, 0);

AñadirAlGrid();

RevisarLineas();

this.enabled = false;
FindObjectOfType<GeneratorLogic>().NewBlock();
}
tiempoAnterior = Time.time;
}

}

bool Limites()
{

foreach (Transform hijo in transform)
{
int enteroX = Mathf.RoundToInt(hijo.transform.position.x);
int enteroY = Mathf.RoundToInt(hijo.transform.position.y);

if (enteroX < 0 || enteroX >= ancho || enteroY < 0 || enteroY >= alto)
{
return false;
}

if (grid[enteroX, enteroY] != null)
{
return false;
}

}

//
position[Mathf.RoundToInt(transform.position.x) , Mathf.RoundToInt(transform.position.y)] = 2;

Debug.Log(position[4,0].ToString());

return true;

}

void AñadirAlGrid()
{

foreach (Transform hijo in transform)
{
int enteroX = Mathf.RoundToInt(hijo.transform.position.x);
int enteroY = Mathf.RoundToInt(hijo.transform.position.y);

grid[enteroX, enteroY] = hijo;
}

}

void RevisarLineas()
{
for (int i = alto - 1; i >= 0; i--)
{
if (TieneLinea(i))
{
BorrarLinea(i);
BajarLinea(i);
}
}
}

bool TieneLinea(int i)
{
for (int j = 0; j < ancho; j++)
{
if (grid[j, i] == null)
{
return false;
}
}
return true;
}

void BorrarLinea(int i)
{
for (int j = 0; j < ancho; j++)
{
Destroy(grid[j, i].gameObject);
Destroy(GetComponent<TextMesh>()); ?????????????
How can I destroy the before objects with textmesh??
grid[j, i] = null;
}
}

void BajarLinea(int i)
{
for (int y = i; y < alto; y++)
{
for (int j = 0; j < ancho; j++)
{
if (grid[j, y] != null)
{
grid[j, y - 1] = grid[j, y];
grid[j, y] = null;
grid[j, y - 1].transform.position -= new Vector3(0, 1, 0);
}
}
}
}

}