Decrease the opacity on your topmost layer. I’m not sure what you mean "like smoke or a window" except that you’re referring to an altered state of opacity.
Not sure if this is what youre looking for but I would make a selection of the window, Use Ctrl-J to put it on another layer. In the drop down at the top of the layers pallette select difference and vary the opacity. This looks like a tinted car window. Tom
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