Those urinal cakes: what do they do? What are they made out of? How are they made?

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Those urinal cakes: what do they do? What are they made out of? How are they made?

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They are made from para-dichlorobenzene, a strong-smelling chemical which slowly sublimates into a gas. The purpose of them is to cover up the smell of urine, and it serves as a disinfectant.