Although you may not care, if Nellie's does not have a full load of your clothes, they will get washed with someone elses. I also remember a long time ago that Nellie's had a problem with rusty machines that would often transfer rust stains to the clothes. I don't know if that is still an issue since I have to do my own laundry now.
I'm not dissin' Nellie (I love that lady) but thought you should know since your wife sounds very particular about your laundry.