Ammnia! Get Ammonia

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Valet (admiring his master's trousers) - i have put everything i could on the spot on your trousers, sir, and it won't come off. master - Have you tried gasoline? valet - yes, sir master - kerosene? valet - yes, sir master - benzine valet - yes sir, all nothing doing. master - but you have tried AMMONIA? valet - no sir, i know ammonia will do it, but these fit me and i - master - aha! - that explains it.