Just how poisonous is laundry detergent?

My housemate has her own, very particular brand of "hygiene", which consists of being wasteful and then complaining about having to pay for electricity, replacement cleaning supplies, etc. She'll only eat off her own plate and bowl - carefully washed with a tablespoon of dish soap each, under running water and dried with paper towels. She'd never use the dish towels we plebs use, but takes it upon herself to wash them - two at a time, on a full, hot cycle. On the other hand, she'll happily use a chopping board for raw chicken, then just lean it against the wall to dry, because "the chicken gets cooked anyway". I never use the wooden one, and wash the plastic ones before every use.

But today takes the cake. We ran out of dish soap yesterday evening (we go through a bottle a week because of her). She passed at least three convenience shops that were open on her way to church, but rather than replace anything, I just caught her washing the dishes that didn't get done last night for lack of soap with laundry detergent. A tablespoon of powdered Daz per plate.

I told her not to do that, it's poisonous. She says it's ok, she's always done this, and added that once a week, she'll scrub all the pans with toilet cleaner . And anyway, the boiling water she pours on it kills all the "germs in the cleaner" that poison you.

When I pointed out that the package said it's harmful if ingested, she told me "that's only science" and you can't believe everything science says...

So, should I be worried about what I've been eating unknowingly? :frown: