Deleting multiple clones

How do I destroy multiple codes by code?

For example

Destroy (GameObject.Find ("Cross(Clone)"));

destroys the "Cross(Clone)"

but

Destroy (GameObject.Find ("Cross(Clone)"));
Destroy (GameObject.Find ("Cross(Clone)"));
Destroy (GameObject.Find ("Cross(Clone)"));

only destroys one clone not three clones, leaving the other two clones undestroyed.

What is the correct code for displaying all three clones at the same time?

Tag them and destroy everything in the array with a for loop.