Procter & Gamble Co. has pushed air freshener Febreze across the $1 billion line.  Though a seemingly optional purchase for cash-strapped consumers, Febreze sold well in the U.S., Europe and Japan during the global economic slowdown, helping it become the 24th P&G brand to reach $1 billion in annual sales.  That small club includes Pampers diapers, Tide detergent and Pantene shampoo.
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