Final answer:
Clean agent extinguishers can be used on fires caused by flammable liquids and electrical fires, but not on fires involving foaming plastics.
Step-by-step explanation:
Clean agent extinguishers are designed to put out fires caused by flammable liquids, such as oils, greases, and solvents, as well as electrical fires.
These extinguishers contain a fluorinated solution that is able to spread across the burning surface and extinguish the fire.
It is important to note that clean agent extinguishers are not recommended for use on fires involving foaming plastics.