Troubleshooting How do I sterilize my Philips Avent ultra soft pacifier? The ultra soft pacifiers are suitable for all forms of sterilization. Sterilize using a Philips Avent Steam Sterilizer or boil in water for 5 minutes. Sterilizer/carrying case Besides that, the ultra soft pacifier can be sterilised the steriliser / carrying case as described in the instruction manual. Important Note that other Philips Avent pacifiers cannot be sterilised in the steriliser / carrying case. We recommend to use a glass plate or a ceramic dish underneath the sterilizer/ carrying case. After sterilization After sterilization, allow to cool for at least 5 minutes, and squeeze out any trapped water from the pacifier.