This is the least commonly used setting on my washing machine, and the mystery of it is just too much for Ethan. He downright begs me to run "gleek keep sanitary" cycles. On the occasion that I need to, all I have to do is yell "deep clean sanitary" across the house and no matter what he's doing or how fun it is, he drops it and comes running, feverish with excitement and just plain giddy. I follow him to the laundry with my hand over my mouth, choking on laughter, tears coming out my eyes. I can't even handle it. The amusement of the whole situation is too much. (He then turns the dial to each setting, naming it aloud as a question, waiting for me to say no to each in turn, before proudly settling on deep clean sanitary. This kid.)