How do you photograph bars, buffets or display cases?

You photograph a clean stretch of what the guest can take now, not the whole case full of reflections. It fails if the glass is dirty or the tray at the back is no longer for sale. Clean the glass, pull what has run out, and keep a gap with nobody standing in front. In Madrid the case is shot through the street reflection and neither the pastry nor the price can be read. You leave with three frames: the stretch, the item close up, and the bar without the door in the glass.