Filters should be cleaned at least once a month or more often if needed.
Place your finger in the groove, push back, and pull down to remove the grease filter.
Groove
Knob
Soak grease filters in hot water and a mild detergent.
Rinse well and shake to dry.
Do not use ammonia or place in a dishwasher. The grease filter will be damaged.
To reinstall, insert the back of the filter, push the filter toward the back, and lift the filter up into place.
Do not operate the hood without the filters in place.