How good does Gain laundry detergent smell Its loyal users are called Gainiacs. 'Nuff said. But if you're the type who thinks with your head as well as your nose, you'll love this: Gain laundry detergent works in both HE and regular machines, and the detergent lifts away dirt and locks in amazing scent to keep your laundry smelling great even after two weeks! We could go on about the Perfume Micro Capsules that gradually break and release scent while you wear your clothes so you're always getting bursts of ahhhhh, but you've probably already left to wash your laundry with Gain laundry detergent. Gain Liquid Laundry Detergent in Original Scent combines overtones of orange, lemon and blossoms with a modern fruity, green twist and undertones of white floral jasmine with a hint of woody amber.