Bleach thrown onto four-year-old girl

A young girl has had bleach thrown in her face from a moving car in Sydney's north west.

The four-year-old was walking with her mum and six-month-old sister when a bottle of bleach was hurled at the family from a passing car.

It happened on Conrad Road at Kellyville Ridge just before 5pm.

The girl has now been released from Westmead Children's hospital.

Police want to speak with two men who stopped their four-wheel drive to help the family, but left before officers arrived.

Anyone with information should call Crimestoppers on 1800 333 000, or use the online reporting page: www1.police.nsw.gov.au