Overly bright reflections on perpendicular faces

[PProcner]

I've had a couple of renders recently where perpendicular or almost perpendicular faces have had very bright reflections on them making them almost appear to glow.
However much i change the environment/lighting, these areas always seem very bright compared to the rest of the image.
First image shows it in its worst form, 2nd image is much better but the bottom of the bottle necks are still brighter than the rest of the image.
Am i missing something? Has anyone experienced this and found a way round it?