Goodbye duvet cover. Even after swimming around in water and me trying to work with it in the water (I will keep the suggestion by @elbutterfield in mind for less extreme cases), it wouldn't untwist. I chopped it up. Inside were the following:
Two bath towels
Three pillowcases
Two hand towels
One dishtowel
Two dryer sheets
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Bummmeeer I was wondering how the water trick turned out!
I had the same issue about a week ago, and it took a lot of hand power to get it unraveled it was very frustrating. But I only had a sheet inside of mine. @publickovacs @elbutterfield