<https://sunohada.com/faq/what-is-a-surfactant-and-how-does-it-affect-gentleness/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sunohada.com/faq/what-is-a-surfactant-and-how-does-it-affect-gentleness/>