Safety first: Unplug before cleaning around electrical areas.

Fix leaks: Identify and repair any leaks from valves, fittings, or hoses that are wetting the corroded area.
Clean gently: Use a non-abrasive cleaner and soft cloth to remove surface rust or stains. Avoid harsh chemicals that can damage stainless or chrome.
Protect surfaces: Keep the machine dry after use and avoid leaving wet cloths on top.
Replace parts: Severely corroded components such as a drip tray or group cover may need replacement.

Group head or boiler exterior shows signs of rust or corrosion.

Possible Causes