Agghhh!!! Water Rings!
Unfortunately this happens all to often (especially if you have children or friends who haven’t heard of coasters). You move a hot or cold drink only to find a big ugly water mark on your wooden table. Ughhh! Use a hair dryer to get rid of water rings.
Use a blow dryer on high. Hold it fairly close to the stain. Slowly, the stain should disappear.
After about 20 minutes the stain was almost completely gone. Then put a little olive oil on it to moisturize the wood. The results were amazing!!