Abstract: A device for treating surfaces of substrates utilized in electronics manufacturing includes a resilient skin encasing a porous polymeric interior. The resilient skin overlies the exterior surface of the brush, and is typically characterized by a higher density, a smaller pore size, and a lower porosity than the interior material of the brush. The skin may serve to distribute physical stress over a larger area, protecting raised or recessed brush features from abrasion and wear. The porosity of the skin may also influence the movement of liquids through the brush, ensuring the homogenous dispensing of cleaning fluids. The resilient skin may be formed during or subsequent to a brush fabrication process such as molding, extrusion, or milling, and can be accomplished through the application of heat, chemicals, or radiation.