Thermador CIT304E - Manual (Page 9)

9
The following types of damage have no effect on either the function or the integrity
of the ceramic glass top.
Pitting
caused by melted sugar or foods with a high sugar content.
Scratches
caused by grains of salt, or sand, or by the rough bottom of a pan.
Discoloration with a metallic sheen
caused by pan abrasion or an unsuitable cleaning agent.
Dulled markings
caused by an unsuitable cleaning agent.
Examples of possible damage