Households with children may use their washing machines...

Households with children may use their washing machines every day, ergo they will be big users of detergent and fabric conditioners. And it's not a huge mental leap to say they also eat a lot of food. If they've got babies, they're going to be using a lot of diapers. And the kids are probably going to eat a lot of confectionary, and they'll be using a lot of soap and shampoo.