Kuhn Rikon DUROMATIC Instruction Manual page 35

The protection cap in particular should only ever be cleaned with a damp cloth
(never use abrasive cleaners, bleach or SWISS CLEANER).
Do not use any corrosive agents like Javel water for cleaning.
Remove obstinate calcium stains (white spots) with a few drops of vinegar, lemon
juice or SWISS CLEANER.
If the pan has become discoloured from overheating, then we recommend the use
of SWISS CLEANER.
If the lid is difficult to turn when closing, then apply a light film of cooking oil to the
rubber gasket.
When storing, place the inverted lid on the pan so that the rubber gasket inside the
lid remains unstressed and free of deformation.
11.1 VALVES
11.1.1 REMOVING THE PROTECTION CAP
Remove all
protection caps
using both hands.
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