Cincinnati-based P&G is a giant in the cleaning products business as well as personal health care and grooming. The odds are your bathroom, kitchen, and laundry are stocked with P&G products. The long list of brands includes Tide, Bounce, Pampers, Downy, Bounty, Charmin, Always, Tampax, Gillette, Head & Shoulders, Herbal Essences, Old Spice, Pantene, Cascade, Febreze, Oral-B, Mr. Clean, Crest, Scope, Vicks, Ivory, and Secret.