Micro-Steam Microwave SterilizerUsing the all natural cleaning power of steam this steriliser kills 99. 9% of harmful germs and household bacteria without harsh chemicals and leaves no nasty residue. And because steam gets into those hard to reach places, you can be reassured that it sterilises those hard to reach areas, getting rid of germs that may linger in bottles, teats, breast pumps and other accessories even after thorough washing.