can't destroy instantiated prefab

Unity Engine
1

So i’m new here.

I instantiate a product by clicking on an item. this makes product(clone) in my game from a prefab.
but the destroy won’t work when I press a button in my GUI window. all code is in the same script.

private GameObject product;

void OnMouseDown(){
 	 GameObject product = (GameObject)Instantiate(productPrefab, new Vector3(24.98F, 32.76F, 16.5464F), Quaternion.identity);
        }
public void DoMyWindow (int windowID)
	{	
	    	if (GUI.Button (new Rect (30,160,100,20), "More info")){		
              //	    	
               }
	    	if (GUI.Button (new Rect (30,180,100,20), "Close window")){
        		showWindow = false;
        		GameObject.Find("ProductCamera").camera.enabled = false;
        		Destroy(product);
	    	}
	}
	}
2

product is a local variable so it never survives outside the scope of your MouseDown function.

Since what you have compiles, I assume you have another product variable in your script. If that is the case, maybe changing:

GameObject product = (GameObject)Instantiate(productPrefab, new Vector3(24.98F, 32.76F, 16.5464F), Quaternion.identity);

to

product = (GameObject)Instantiate(productPrefab, new Vector3(24.98F, 32.76F, 16.5464F), Quaternion.identity);

would solve the issue?