They're not, but at $24 (from the ebay link) that's a pretty inexpensive thing to possibly help with the odor. Charcoal-activated filters typically can't be cleaned, they have to be replaced. The stock filter though, maybe? I wouldn't think it'd be worth it though. A charcoal filter is surely going to be more effective than a plain paper one any day of the week.
I bought my '13 new in early 14, but it had been a manager's ride for about a month. It had about 2500 miles on it. When I bought it, it didn't have any odor (and as well, unfortunately, not too much of the "new car smell" was left either). When I took it in for the first service (~5K) I immediately noticed the smell when I got it back. I even complained about it, but I didn't push the issue when it *seemed* to dissipate on its own. That was short lived, and by the time I took it in for the 10K service, after only 6 months of ownership, the smell was driving me crazy. That's when the service rep told me about the recirc, and when I learned their "replacement" filter was not even charcoal activated, and was something ridiculous like $85.
I found the charcoal filter on ebay, bought 3 of them, and when I replaced it, I was amazed at how filthy the original one was. You may be surprised to see how dirty yours is when you go to replace it. I wouldn't bother trying to wash it, just replace it with a charcoal one and see if that helps. It helped mine a lot. Combined with using recirc, and the cooler weather, the odor in my car has diminished greatly. It has not 100% gone away, but it's way better than it was.