I might be off but personally whenever I see a "shiny" leaf to me it is always a really well grown leaf.
You see leaves with yellow, black, brown spots on them, no matter how much you polish those leaves, they will never shine. Why? Because they are stressed in some way either by pests of fungus or whatever.
So like said I might be off but to me a shiny leaf is not one that has been washed, my best leaf pictures are leaves that never touched any water. The healthier my leaves, the shinier they show in pictures. That is how I see things.
It has also been mentioned that leaves deteriorate as they age - lose their young shiny look and get a more aged, leathery look
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