Do you think your washer is somehow not already contaminated with feces, from washing underwear?

I read an article a while ago that tested and found substantial fecal residue in typical washing machines, without cloth diapers going through them. Can't find it now among all the cloth diaper related search hits.

My grandma always used to wash undies by hand separately and then pour boiling water over them. I found it to be very weird when I was a kid, but she might have been onto something. I would do this if I was living with an immunocompromised person but its probably overkill for a healthy family.

It's also suggested you clean the washer every once in a while too.

Fecal bacteria is found everywhere it seems, so that's why frequent hand washing (especially before food prep) is important.

Good point.

Detergent and water gets just about anything clean..

However, you presoak them, and scrape a majority of the feces off into the toilet at change time.

You rinse diapers in the toilet before washing them.