White spots inside a Philips kettle? Check the model-specific descaling steps
White deposits in certain Philips kettles may be mineral scale. Follow the exact model's instructions for approved descaler or white vinegar, then boil and discard fresh water to rinse.
Philips says interior spots may be mineral scale and buildup can slow boiling. For examples such as HD4631/20, HD4664/20 and HD4670/20, it describes adding 8% white vinegar after boiling water. Other kettles use different vinegar concentration, buttons and timing; do not apply this recipe without matching the model.