Hood Filter Soak is made specifically to remove baked on grease from hood vents/filters.  Certifiable Green Product. Highly efficient grease release technology.   Pour premesured bottle into a sink of hot water up to 20 gallons.  Place hood vents/filters in the sink with at least 2 inches of water over filters. Let soak over night for heavy grease build up or soak for 30 minutes to a few hours for light grease. Remove and rinse with hot water.   Great as a carbon soak or presoak for greasy items.