Forget all cookies on laravel Login controller

I am using Laravel 5.5 and Php 7.0 . I want to attach a function to clear all existing cookies set by my site before attempting login.The code of LoginController unchanged is

use Johnson\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
    */

    use AuthenticatesUsers;


    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = '/home';

    /**
     * Create a new controller instance.
     *
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }
    public function username()
    {
        return 'username';
    }
}
?>

How can I remove all cookies before showing login page if not logged in?I am using default laravel login page.

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