How to completely destroy session in Laravel

I'm currently working with Sessions in laravel, but I got stacked in here. Here's the scenario, I have a controller which creates a product item and after that, I have this code:

return redirect()->route('products')->with('success', 'Created!');

and in my view, I'm using sweet alert js plugin and I have this code.

@if(Session::has('success'))
    <script>
        swal('Success!', '', 'success');
    </script>

    <?php Session::flush(); ?>
@endif

So I used Session::flush() to destroy all the session. I also tried <?php Session::forget('success') ?>, but no changes was made. My problem is, after I create a product it returns to a view and displays the sweet alert box, there's nothing wrong with that, but, when I visit the product and click back button (browser's built-in back button) it displays the sweet alert box with Created! message again, which MUST Not be. Why is that?

via Chebli Mohamed