They are dishwasher safe, however, the residue from dishwasher tablets can be left on the silicone beads. I advise the items to be washed with mild soap and warm water. If you wish to sterilize them, you may do so with boiled water (sit for 5 minutes) or use a bottle sterilizer. Safety: Customers should always inspect and monitor their products for wear and tear, discontinue use at the first sight of any damage. Cords, clasps and pacifier clips are not intended to be chewed on and parents should watch children at all times.