Troubleshooting How do I sterilise Philips Avent ultra-soft pacifier? The ultra-soft pacifiers are suitable for all forms of sterilisation. Sterilise using a Philips Avent Steam Steriliser or boil in water for 5 minutes. Steriliser/carrying case Besides that, the ultra-soft pacifier can be sterilised using 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 using a glass plate or a ceramic dish underneath the steriliser/carrying case. After sterilisation After sterilisation, allow to cool for at least 5 minutes, and squeeze out any trapped water from the pacifier.