Miele CVA 7440 Operating And Installation Instructions page 15

For coffee machines with stainless steel surfaces:
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Do not use sticky notes, adhesive tape, or other types of adhesive
on the stainless steel surfaces. These will damage the stainless steel
surfaces, causing them to lose their dirt-repellent protective coating.
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The finish on stainless steel surfaces is susceptible to scratching.
Even magnets can cause scratches.
SAVE THESE INSTRUCTIONS
Warnings and safety instructions
15