How to clear textures on screen?

Hi!
I want to clear all of textures on screen when my car crashed the barrier. For example; I want to delete “Time left” texture on the image. But I want to that game over screen will continue to appear. How do I make this?

36832-screenshot_4.png

i assume that code to show the time etc is in OnGUI.

So just put a bool around it and set it to false when collided.

void OnGUI()
{
    if(show == true)
    {
        gui label and stuff
    }
}