You iron it out. Put a towel over the ring, iron on a medium heat, keep your iron moving until the white is gone. There is a video on you tube you can watch showing how it’s done.
We bought our home in Nov. 2013 and I noticed in the sunroom (built on the back patio slab) that the North window had this plastic (very thin) stuck on it. It's as if...
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You iron it out. Put a towel over the ring, iron on a medium heat, keep your iron moving until the white is gone. There is a video on you tube you can watch showing how it’s done.
https://www.hometalk.com/diy/repair/furniture/how-to-remove-a-water-stain-from-your-wood-furniture-in-5-minutes-39242413
HOW TO REMOVE A WATER STAIN FROM YOUR WOOD FURNITURE IN 5 MINUTES!