Great question — answering as the UphillTech team:
As a former cadet pilot in the French Air Force, my class and I used to set fire to the polish in its box, then quickly put the lid back on it to put out the fire. We then used a regular rag to polish the boots, then the special trick was to use stockings , "borrowed" from the only girl in the class, stretching them with two hands, then polishing the boots with them, without adding any more polish. As English is not my native language, I have trouble explaining it, so feel free to ask for further explanation.
Full answer by Thesaurus Rex: https://lifehacks.stackexchange.com/a/9891 (CC BY-SA 3.0).
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