Recology instructed San Francisco school officials to not recycle the recyclable plastic trays the district uses daily to serve students food. So reports the Chronicle, which details the policies of the city-contracted waste company that began in 2013 and may have only stopped when questions started being asked about the bizarre instructions given to school officials.

“Recology has told us they don’t want any plastics because they’re too soiled,” the principal at Commodore Sloat Elementary Schoo, Greg John, told the Chron. “It’s now institutionalized.” Of course, the trays are perfectly recyclable — covered in food or not. Food scraps mixed in with paper, which is recycled in the same bins, lowers the resale value of the paper for the company, however, and this is the main problem.

In response to what is clearly a PR nightmare for the company, spokesperson Robert Reed dug a little deeper and attempted to shift the blame to school children too "lazy" to rinse off the trays before disposing of them.

“If you were just lazy and tossed a plastic tray into the recycling that had spaghetti sauce on it, you would be diminishing the quality of the paper that’s getting ultimately recycled,” Reed said.

Recology later attempted to backpedal.

“We accept all hard plastic food trays for recycling,” noted Reed. “We only ask that students who do not finish their meals shake any uneaten food into the green composting collection bins that we provide.”

What about that whole zero landfill waste by 2020 thing, though?

Related: More Of San Francisco's Trash Went To Landfills Last Year, Not Less