Toilet Duck
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Toilet Duck is a brand name product toilet cleaner produced by S. C. Johnson & Son noted for the unique duck-shape of their bottles, so shaped to assist in ease of cleaning under the rim of the bowl, patented in the 1980s by Walter Düring from Dällikon, Switzerland.
Toilet Duck suppliers are becoming increasingly scarce in the United States. The Toilet Duck brand can be found in the UK.
check this link (pdf in german) to expand information: http://www.zuonline.ch/blickpunkt/pdf/080706.pdf
[edit] Links
S. C. Johnson Product Page YouTube Toilet Duck Commercial link