hmmm, yeh thats a tough one. It is really hard, im not really great at it...but I find the best way is to use a Brush, set on Dodge mode (white) and simply draw one when you think the 'shine' should be.
Heres an example, not great but the only edit i've done that i still have saved

OK, so heres the aircraft before shine...

And here it is after a bit of work...

Just have a play really, infinite ways of doing stuff in photoshop...
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