Yup. I had a mental moment.
I'm blaming it on the blog post that consumed most of my morning. That, and having a fairly new washer that has a fancy-pantsy steam clean function that I tried for only the second time this morning.
So there I was, trying to get the socks and underwear load really, really clean and sanitized, and I run the batch without soap. Which I didn't realize until over 2 hours later. That's right -- the steam/sanitize function takes TONS of TIME -- over 2 hours! And for some reason as it was running, the machine experienced a blip that caused it to stop and display an error message. So I go into the laundry room, irritated to be drawn away from the day's important blog post, and figure that it's just easier to start the batch over on the regular cycle that only takes 40 minutes.
Not until that cycle finished and I was transfering the wet socks to the dryer did I realize that neither batch had detergent in it.
Yup. I ran two batches of laundry (2 cycles) without a lick of detergent.
Must be Monday.