“Anti-fogging sprays and cloths often used to prevent condensation on eyeglasses from wearing a mask or on face shields may contain high levels of potentially toxic PFAS “forever chemicals”, according to a new study led by Duke University.
Researchers tested four of the top-rated anti-fogging sprays as well as five top-rated anti-fogging cloths sold by Amazon. In all nine products, experts found fluorotelomer alcohols (FTOHs) and fluorotelomer ethoxylates (FTEOs), two types of per- and polyfluorinated alkyl substances (PFAS).”
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Oladipo, Gloria. The Guardian 5 January 2022.