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Maybe you’ve seen the ads on Instagram: Little sheets of concentrated laundry detergent avoid the need for a big plastic jug of liquid soap. Ldpe Film Roll

Instead, these perforated sheets come nestled in plastic-free cardboard packaging. Their ads describe them as the most “environmentally responsible way to do your laundry.”

The problem? Those nifty little sheets are held together by plastic.

It’s a polymer that’s designed to dissolve in water, but most of it isn’t filtered out on its trip through wastewater treatment plants.

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Kathryn Lundstrom is Adweek's sustainability editor.

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