Zephyr AK7036BS Use, Care And Installation Manual page 42

Cleaning of the duct cover should be done frequently to preserve the
life of the stainless steel. Cleaning should typically be done once a
month depending on your cooking habits.
When cleaning, use a non abrasive cleaner, do not use "orange"
cleaner. Abrasive cleaners may scratch the surface and discolor the
stainless steel.
You may also polish the stainless steel by using stainless steel polish.
Make sure when polishing to go along with the grain of the duct cover.
Zephyr Ventilation
2277 Harbor Bay Parkway
Alameda, CA 94502
888-880-8368
5