Do Flies Poop on the Walls

Yeah, all those little dark spots are mostly fly “poop”. Flies regurgitate and excrete wherever they come to rest and thereby mechanically transmit diseases. This image is a combination of fly poop flecks and vomit spots on a wall.

What is the black stuff flies leave behind?

Flies’ mouths are soft and spongy; they can’t chew. In pretty short order, the food is metabolized, and they poop out the rest in what we usually call “fly specks.” Fly poop is tiny black or brown dots. You might also find amber-colored spots, but that’s excess SFS left over from the meal.

How do you remove insect poop?

To remove insect excrement stains from washable clothes and fabrics, first mix a solution of oxygen-based bleach (brand names are: OxiClean, Nellie’s All Natural Oxygen Brightener, or OXO Brite) and cool water.