The washing bag has no effect on the washing result. Washing agent and water reach the textiles. As long the textiles are able to move around in the washing bag (do not overfill) your laundry gets clean while the sea stays unpolluted. The German Textile Research confirms the bags efficiency. They tested among others stains of blood, chocolate, clay and ketchup. We recommend removing coarse dirt and animal hair before doing the laundry.