strange circular symbols on my fogged up car window

Hello…I need some help. Last night there was a thunderstorm and when the rain stopped I went to my car to drive home, but I noticed two softball-sized circles on the back window and I’ve been wracking my brain ever since trying to figure out how they got there and what they mean. Has anyone experienced this sort of thing before? I took a photo and played around with some editing tools to make the image clearer but it’s still pretty rough. This morning I tried replicating the event by steaming that window from the inside and the circles appeared again. Check out the photos and let me know what you think! photo 3.PNGphoto 2.jpgphoto 1.PNGphoto 1.jpg
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