Fading Blur

So for my main menu I want the background to be blurry until the play button is pushed. From there the UI will fade out and the background will unblur to reveal game. Now I know unity has a bluring script but I can’t get it to be completely clear. Does anyone know how to fix something like this.

Having reduced the blur size down to zero, you’d make it completely unblurred by disabling the component:

GetComponent<BlurOptimized>().enabled = false;