Hide related products text and entire row of releated products in WooCommerce

gistfile1.txt

# There are two ways we can do this. 
# Either using CSS or using remove action hook. 

# Using CSS
.related.products {
  display: none;
}

# Using remove action
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20 );