Fans had a common reply: Spider poo.
Mrs. Hinch fans were quick to help, saying it was spider droppings. One wrote: “Happens a lot this time of year, spiders pooing everywhere. Dettox spray works.” Another said: “It’s spider poo after they eat flies. I get it on my windowsill.” Some thought it could be “fly poo,” but one was sure: “Definitely spider poo.”
What do the experts say?
Experts on pests say spiders usually don’t leave solid waste. Their poop is thick and liquid, like dark ink stains, often on walls.