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Posting a pic with exif info will help with a more definitive answer....
Is the "glare" reflective or from overexposure?
A polarizer is most efficient when the light source (sun) is 90* to the subject, from where you're shooting - and some variation of efficiency as to how far off that 90* you may be - i.e. - if the sun is in front or behind the camera shooting the scene, the polarizer has zero effect, except from slowing the shutter speed 1.5 to 2 stops.
Are you exposing properly for "snow" (overly white) scene conditions? Many times a snow type scene will require using a higher (longer) exposure compensation - i.e. - if you're getting a really dark blue sky, you may need a longer exposure. Of course, exposure bracketing is always a good technique for finding that correct exposure.