It is a great designed sponge brush for baby milk bottle. Steady handle that fits your hand well for good grips and control. All smooth thick plastic will not scratch your hand or milk bottles. Give a high speed spin, dirty stuff comes off fast. You could also hold the white part handle to control the brush direction and clean the tougher stain. Wash only smooth surface stuffs and good raise and squeeze dry after each use. This good quality sponge brush will last a looong time.