We find homes often times that are really clean are the worst. If they don't use a disinfectant product in the kitchen, they're making things worse. The toilet is often at the bottom of his list because many people clean with disinfectant there. Public restrooms offer their own challenges for navigating a germ war zone. If you do a load of undergarments you could have 10 to 100 million fecal bacteria in your washing machine and the next load gets it.
Soap helps spread it through all the laundry.
In one study researchers gave sterile clothes to people and asked them to include the clothing in their regular laundry. E.coli infested almost half the sterile clothes after the full cleaning cycle. E. coli won't survive the dryer but salmonella bacteria and many viruses do survive. The very young, the very old, and immunocompromised people are most at risk. Pathogens thrive when people live in crowded places and in unsanitary conditions.