What should I do to prepare the cooktop before using it for the very first time?

Remove all packing materials and literature from the cooktop surface, then wipe it with a clean, damp sponge and dry it while cool. Next, apply the Cooktop Cleaning Creme® packaged with the cooktop and buff with a clean cloth. There may be a slight odor during the first several uses, which is normal and will disappear. Read all safety precautions and Use and Care Manual information prior to operating. (Page 5)

From the official Bosch NEM73UC Cooktop manual, page 5

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