For situations like this, I suggest blissful ignorance.

Using their poop knife.

Have you heard of kitchen sink spaghetti? Well now you have. Enjoy the meatballs!

As a wise man once said, "you can't eat at everybody's house."

Thank God dishwashers are not that common in my country because I'm sure stupid people would use it like this.

Sometimes it's great having life threatening allergies - my whole life I've never trusted food that anyone else has made, I have perfected the art of the polite rejection.

I see things like kitchen sink spaghetti, dishwasher fish, and now dishwasher toilet brush, and I look back at how I've coincidentally dodged all those bullets.

(Growing up, in my house "kitchen sink spaghetti" was sometimes also called "crisper drawer pasta", it was all the wilted, sad vegetables that had been neglected in the fridge. Chopped, roasted, pureed, and served on pasta.... No actual sink involved, we just called it kitchen sink spaghetti because it contained "everything except for the kitchen sink"...so learning that some people genuinely use the bare sink to drain pasta - and not just for click bait and views was disgusting eye opening)