The Laundress Le Labo Signature Detergent in Rose 31. The Laundress Le Labo Signature Detergent in Rose 31. Designed for all-purpose laundering, Signature Detergent is perfectly formulated to whiten, brighten, and preserve color while removing stains. The Laundress and Le Labo united to blend the finest of modern perfumery: thirty-one ingredients blended around rose, combined with notes of cumin, olibanum, and cedar to create a scent designed to be both feminine and masculine.. Preserves and increases the longevity of garments. Non-toxic, biodegradable, highly concentrated, vegan & cruelty-free. Free of Allergens, Petroleum, Phosphate, Phthalates, and Artificial Color. 16 fl oz/ 475 ml (up to 32 washes). THEL-WU4. Labo-Rose. Co-founders Lindsey Wieber and Gwen Whiting created this luxury fabric care and specialty detergent line to take the chore out of laundry. This travel pack will be your savior on long trips.