Authorities around the country have initiated a massive campaign to recall and destroy all contaminated baby formula milk powder.

Major supermarket chains have emptied their shelves of all products made by the disgraced Sanlu Group. The only milk powder for sale is from brands shown to be melamine-free.

The quick response comes as melamine, a toxic chemical, was found in batches of baby formula from 22 manufacturers around the country.

Supermarkets reacted quickly when they received word about tainted brands.

Supermarket sales staff, said, "We cleared all the contaminated milk powder on the very same morning when headquarters called us."

Many supermarkets say Sanlu dairy products for infants have sold poorly for a long time. Sales personnel say most people choose to buy imported products.

Supermarket sales staff, said, "The sale of Sanlu products is not good here. Actually we cleared their products one months ago."

In Shanghai, quality and market watchdogs have been closely monitoring the massive recalling campaign.

Inspectors are revisiting stores to ensure a smooth recall. This supermarket removed all Sanlu products last week. They also got rid of products on the latest list issued by national authorities.

Shanghai's municipal government has ordered supermarkets not to return contaminated products to the manufacturers.

The same campaign against tainted milk powder has been carried out all over the country and manufacturers now allow customers to return unsafe products.