On Velvetisers that are well-loved and used often, you may notice some dark smudges collecting on the base of your whisk and jug. Please be assured these are perfectly normal and the result of high-quality cocoa in your shavings. The smudges are a blend of the natural occurring content of your chocolat flakes and milk which bond and accumulate on the whisk base.
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To prevent this cocoa build-up from causing potential problems with your device, please ensure you are cleaning the whisk and jug regularly.