There comes a moment-usually somewhere between your first attempt to remove exhaust staining from a polished aluminum panel and your realization that aviation-grade dirt is somehow more committed than ordinary dirt-when you understand something important: You are not cleaning an airplane. You are negotiating with a machine that is certified to fly, not to look good. An aircraft is not an RV with wings. It is a regulated system of materials, coatings, fasteners, composites, and tolerances that exist under pressure, vibration, temperature extremes, and inspection requirements that do not care about your preferred shine level. Every surface has a function. Some surfaces also have an opinion.
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