Packages which comprise a substrate and one or more fabric treatment chemicals, wherein the fabric treatment chemicals are released from the substrate through the action of temperature, friction and/or contact with water. Methods for treating fabrics, the methods comprising the step of opening a package, the package containing at least one unit dose of detergent, and subsequently dissolving and/or dispersing the detergent composition to provide a wash liquor, and wherein the package comprises an insoluble substrate and one or more fabric treatment chemicals, the chemical-containing substrate being used to directly or indirectly apply the fabric treatment chemicals to the fabrics.