The Dehaze effect in the Effects panel in Lightroom and now in the Graduated and Radial filters as well as the adjustment brush acts much like a polarizing filter when used on images with water in them. It should act exactly the same way for an image with glare in it. Select the Adjustment brush, turn on the mask overlay by pressing the "O" key on the keyboard or placing a check mark in the box labeled "Show selected mask overlay" in the toolbar. Select a color for the mask overlay that will have enough contrast to be seen on the image. To do this click on the Tools menu at the top of the screen and from the bottom choice, select red, green, black or white. Make sure "Auto Mask" is turned on. Size the brush and add a small amount of feathering then paint over the glare in the image. If you hold down the space bar, the cursor will turn into the hand cursor and you will be able to magnify the image and move it around on screen. This will allow you to make an accurate selection. When finished with the selection, turn off the mask overlay, move the Clarity slider to about 25-30 on the slider bar. Finally, move the Dehaze slider to the right until all the glare has disappeared. Be careful with the Dehaze slider, it tends to cause loss of detail in some shadows, particularly in the blue channel that you will have to recover.
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