You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you do which of the following?

Correct Answer: Option C — Water wash the compressor.

Compressor water washing prior to a borescope inspection is essential to remove salt deposits and particulate buildup. Cleaning the compressor blades ensures that the inspector has a clear, unobstructed view of the blade surfaces and leading edges, allowing for an accurate assessment of the engine's internal condition.