Range hoods filter the grease and smoke produced when you cook. Exhaust from the range hood vents outside through a duct, or recirculates into the room after it has passed through a filter. A charcoal filter decreases smoke and odors associated with cooking, and is usually found only in the recirculating type of range hood. It is important to note that you cannot clean charcoal filters; they require replacement.
Fill a sink or bucket with hot water. Add an ample amount of dish soap and vinegar. Mix the solution thoroughly.