Patent ID: 8283305

Claim:
A cleaning implement, comprising four layers of substrate in a sandwiched configuration, wherein an erodible foam substrate is positioned as both of the outside layers attached to two middle layers by adhesion, wherein (a) the erodible foam substrate comprises from about 5% to about 20% by weight of an active agent in free form; and (b) an aqueous controlled release system comprising: (i) a remainder of said active agent, and (ii) a hotmelt polymer matrix consisting essentially of an effective amount of water-soluble polyethylene glycol having an average molecular weight in the range of from 1,500 to 9,000 g/mol, wherein said active agent is selected from the group consisting of a surfactant, a bleaching agent, a limescale reducing agent, a biocide, a solvent, and a mixture thereof and is released from said controlled release system by an activation means selected from the group consisting of: water activation, degradation, friction, and combinations thereof, wherein the aqueous controlled release system is applied in-between the two middle layers.