Gain Powder Laundry Detergent in Island Fresh Scent. For more of the scent you love, try adding Gain Fireworks and Gain Fabric Softener to your wash. Powder laundry detergent with brilliant cleaning performance that leaves behind a refreshing Gain Island Fresh scent. 6 weeks of freshness from wash until wear. Regular and HE Washer compatible. Like any household detergent, keep away from children.