How to say “Has that pet bowl been rinsed since the food demonstration?” in Japanese

In Japanese

そのペット用食器(ようしょっき)、フードの実演(じつえん)が終(お)わってから一度(いちど)すすいだ？

Sono petto yō shokki, fūdo no jitsuen ga owatte kara ichido susuida?