Toilet Duck Liver 31 January 2013, Cervera de los Montes A4 (29,7 x 21,0 cm) Acrylic color, felt-tip pen and ink-jet print on paper i Toilet Duck is a brand name toilet cleaner noted for the duck-shape of its bottle, so shaped to assist in dispensing the cleaner under the rim. The design was patented in the 1980s by Swiss Walter Düring. It is now produced by Johnson & Son. Duck liver is used for foie gras, a popular and well-known delicacy in French cuisine. Tags: duck, toilet, liver, foie gras 218 / 779