Distinguish deposits from missing material

Look for raised deposits and compare them with pits, exposed layers or a damaged edge in the available images. Both conditions can coexist, so identifying insects does not close the erosion question. DOE discusses leading-edge soiling as an airfoil-performance issue. That background supports considering aerodynamic effects, but provides no universal generation penalty for a particular deposit pattern or a MARSTON blade.

Define a controlled cleaning assessment

The supplier should identify a method compatible with the actual coating, laminate and nearby materials. Do not transfer a cleaner from painted metal or use an abrasive treatment because the deposit is difficult to remove. Where cleaning is approved, the condition comparison should distinguish removal of contamination from changes to the finish. Access and machine isolation remain tasks for the qualified service team, not a ground-observer procedure.

A before-and-after image can show whether deposits were removed, while a separate surface assessment establishes whether the finish remained intact. Keeping those findings distinct prevents a successful cleaning task from being mistaken for evidence that every original rough region was only contamination.

Choose the next performance or repair question

If the surface is intact after approved cleaning, any performance comparison should use comparable wind and operating conditions. A change in output alone cannot quantify the aerodynamic effect when the weather also changed. If the revealed surface is eroded or damaged, request the appropriate blade assessment. No MARSTON cleaning interval, cleaner, roughness limit or recovery percentage is established here; the decision depends on the actual surface and exposure.