The PDSA said: "Antifreeze contains ethylene glycol, which is an extremely toxic chemical. Ethylene glycol is also found in car screen wash, brake fluid, radiator fluid and garden water features.

Propylene glycol can be used in a wide variety of products, from non-toxic antifreeze to shampoo and even ice cream. Since its economic value is so much higher than glycerin, the cost of biodiesel ...