Dry hand-washing with specific aeronautic products authorized by the aircraft manufacturers. In some airports, where it can be done, All Flying Services propose also a wet washing with low pressure water. This is particularly indicated for light dirt, sand or saltiness.
Quick dry-cleaning of the external surfaces, in case of quick turn-around, requires the removal of particular traces of dirt or insects localized on the windshield, the nose or the leading edges, or to clean residual de-icing liquid.
Handmade treatment with specific products to give more brightness to the aluminum surfaces (leading edges, engine inlets etc.) and to the paint of your aircraft.