Kloon on "[Plugin: WooCommerce - excelling eCommerce] A button to empty the chart !?"

Add the following code to your theme's functions.php file and then just append ?clear-cart to any of your site urls

// check for clear-cart get param to clear the cart
add_action( 'init', 'woocommerce_clear_cart_url' );
function woocommerce_clear_cart_url() {
	if ( isset( $_GET['clear-cart'] ) ) {
		global $woocommerce;
		$woocommerce->cart->empty_cart();
	}
}