The unique handle enables bottles to be washed in 2 different ways:n Vertical Wash - Use the brush handle and bristles in straight up and down actionn Circular Wash - Hold the handle firmly and rotate the brush inside the bottlennThe special plastic coating on handle prevents damage to the mouth of bottlennThe flexible, folded Sponge of Sponge Brush allows you to remove stubborn dirt and the shape lets you wash thoroughly even at the hard-to-reach places in bottle