Supermarket giant Sainsbury's has issued an apology over its substandard hygiene at the Stevenage Poplars store - just days after admitting not meeting hygiene standards at its Corey's Mill store.

A worried customer had contacted the Comet to raise concerns of salmonella over dirty shelves holding raw chicken at the Stevenage Corey's Mill supermarket.

Sainsbury's said its stores have "strict hygiene rules" and apologised that "these usual high standards were not met in this instance".

Now, another customer has come forward to highlight the dirty state of the shelves holding raw chicken and milk at the Stevenage Poplars store.

The milk shelves were clearly filthy.The milk shelves were clearly filthy. (Image: Supplied)

Having taken some photos of the filthy shelves, he said: "These were taken as there was somebody standing by replenishing the shelves. They’ve looked like this for months."

The shelves holding raw chicken were not clean. The shelves holding raw chicken were not clean. (Image: Supplied)
Sainsbury's has apologised for not meeting its hygiene standards yet again.

A spokesperson said: "We maintain high levels of hygiene and cleanliness in our stores and we're sorry that these were not met on this occasion.

Sainsbury's says it has now cleaned the shelves.Sainsbury's says it has now cleaned the shelves. (Image: Supplied) "Colleagues have taken action to return the shelves to their usual high standards."