Which methods are typically used for interior kitchen exhaust duct cleaning?

Which methods are typically used for interior kitchen exhaust duct cleaning?

• A. Wet washing with detergents or agitation, brushing, and sometimes high-pressure water cleaning as allowed by code.
• B. Manual scrubbing with dry brushes only.
• C. Substituting with power washing of metal.
• D. Using solvents that may damage metal.

Answer: (C)