From page 59 of the user manual:
Instructions for the user:
11. CLEANING AND MAINTENANCE
The oven must be periodically cleaned to maintain its working characteristics unaltered. Inadequate cleaning could jeopardise its appearance and above all its functioning.
Before performing any operations requiring access to powered parts, switch off the power supply to the appliance.
Do not use a steam jet for cleaning the inside of the oven.
11.1 Cleaning stainless steel
To keep stainless steel in good condition it should be cleaned regularly after use. Let it cool first.
11.2 Ordinary Daily Cleaning
To clean and preserve the stainless steel surfaces, always use only specific products that do not contain abrasives or chlorine-based acids.
How to use: pour the product on a damp cloth and wipe the surface, rinse thoroughly and dry with a soft cloth or deerskin.
11.3 Food stains or residues
Do not use metallic sponges or sharp scrapers: they will damage the surface.
Use normal non-abrasive products and a wooden or plastic tool if necessary. Rinse thoroughly and dry with a soft cloth or deerskin.
Do not allow residues of sugary foods (such as jam) to set inside the oven. If left to set for too long, they might damage the enamel lining of the oven.
11.4 Cleaning the oven
For best oven upkeep clean regularly after having allowed to cool.
Take out all removable parts.
-Clean the oven grill and side guides with hot water and non-abrasive detergent. Rinse and dry.
-For easier cleaning, the door can be removed:
11.5 Removing the door
11.5.1 removing doors with mobile hinges
Lift the levers B until they touch the hinges A and take hold of the two sides of the doors with both hand close to the hinges. Raise the door to an angle of about 45 degrees and remove it.
To reassemble, fit the hinges A into their grooves, then lower the door into place and release the levers B.