Something unsavory is staining siding, sidewalks and patios in Menasha, Wis., and residents suspect it's something in the air.
Authorities got reports last week of many spots and clumps found along a flight path for the Outagamie County Regional Airport in nearby Greenville, said police Lt. Mike Krueger.
"It looks like somebody released the holding tank for their septic and that fluid was dropped through that section of neighborhood, and it stains," Krueger said.
Said resident Kate McQuillan: "Something definitely got sprayed all over."
An airport official and an airline representative visited the scene but "denied it was one of their planes" that caused the problems, Krueger said.