What is the primary difference in the effectiveness of wash methods?

• A. It is cheaper to run
• B. It cleans the turbine area more effectively
• C. It eliminates the need for inspections
• D. It uses no water

Answer: (B)

Wash methods differ mainly in how well they reach and remove deposits from the turbine area. The turbine portion of the engine sits in the hot, high-velocity flow path and can accumulate stubborn varnish and coking on blades, vanes, and seals. A method that effectively contacts and dissolves or mechanically dislodges deposits in that area will restore airflow and turbine efficiency more than one that mostly cleans the compressor or exterior parts. So the key difference in effectiveness is how thoroughly the turbine region is cleaned, which is why the option stating it cleans the turbine area more effectively is the best choice.