How to Descale the Avent Steam Sterilizer


The Avent Steam Sterilizer is a handy tool for moms who need a quick way to disinfect bottles, lids and breast pump parts. Over time, mineral deposits (lime scale) will accumulate within the machine and around the heating coil. These deposits may be particularly heavy when hard water is used. Avent recommends descaling the sterilizer once a month to keep it at optimum effectiveness.

Things You'll Need

  • Citric acid
  • Water
  • White vinegar

Citric Acid Method

  • Combine a 10g packet of citric acid and 200 mL of water. Remove the sterilizer's cover and transfer the mixture to the empty machine. Citric acid is available at pharmacies.

  • Turn on Mode 1. Allow the sterilizer to run uncovered for one to two minutes.

  • Disconnect the unit and set it aside for half an hour.

  • Pour out the citric acid mixture and run clean water through the sterilizer.

  • Replace the cover and activate a complete sterilizing cycle using precisely 90 mL of water. Do not attempt to sterilize any bottles or other equipment at this time.

White Vinegar Method

Tips & Warnings

  • Use filtered or distilled water to minimize lime scale accumulation.
  • Avoid using bleach, antibacterial agents or other chemicals in the sterilizer.
  • Avoid using water from a softener in the machine.


  • Photo Credit 06photo/iStock/Getty Images
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