Police are hoping to identify a man who exposed himself to a speed camera car in January.

Two men approached a mobile speed camera operator in Rowville on Australia Day, with one of the men then taking off his clothes, exposing himself and screaming abuse at the operator.

The men then walked away, returning about an hour later with alcohol, when the same man then exposed himself again.

The men are believed to be in their 30s, both Caucasian. 

CCTV footage has been released in the hopes that it will help Knox police identify the men.