Before we received was more like how to reduce glare on the water or glass problem , the normal practice is to use a circular polarizer (CPL), the problem is just the other way round , and asked very good ! When the sun is overhead or positive when shooting against the sun , the reflection of the effect is the most obvious. Therefore , in order to get the ideal reflection, the best time to shoot is early morning or evening . When the sun hanging over his head , a strong reflective surface will greatly reduce the reflection of the surrounding landscape . Similarly, when the subject is exposed to direct sunlight will be the best reflection of our results.
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See all - http://worldlatest.net/2013/12/07/strengthen-the-reflection-on-the-lake-when-shooting-it-becomes-mirror-like-calm/