Around 6,000 litres of milk had been stored at these tanks, collected from Polonnaruwa and other surrounding districts.

The company will have to suffer a loss of around Rs. 01 million, as the milk will have to be thrown away, say its employees.

Similar instances happened in the past too, due to the shortsightedness of the management, they charge.

Milco general manager Sudath Munasinghe said the milk had been contaminated with a mouthwash, adding that an investigation was underway.