Gardai flagged down a driver in Cork today after they still had ice on their window while on the road.
Officers in West Cork said the motorist's view was restricted and was a danger to other road users.
They added on social media: "On such a cold and fogging morning light up and defrost your windscreen."
Separately gardai have warned that when defrosting your car you should not leave it unattended.
It's actually illegal to leave a car unattended while it’s heating up, with fines and jail time on the cards for those who ignore this.
However, it can also result in your car being taken from you - and not by the Gardai.
In a Facebook post on Monday morning, Gardai in Waterford, Kilkenny and Carlow issued a warning on how "idling" your engine could invite thieves to steal your vehicle.
The post said: “Well Monday came around like an icy sledgehammer bringing an end to any lie ins.
"As well as making school lunches, feeding the dog, dressing the kids make sure and clear those windscreens and front side windows.
"Don't leave an unattended vehicle running in a public place, someone could take it and your insurance would be likely invalid."
Leaving a car unattended while it heats up has been labelled “too risky” by Gardai in the past.
Gardai for the Donegal division said: "Freezing conditions at night mean frozen car windscreens in the mornings but please do not start your car in order to defrost it and leave it unattended particularly in a built up area. It is much too risky.
"Do not make life easy for opportunist thieves who would be only too happy to take your motor off your hands!
"When defrosting your vehicle, defrost externally by using de-icer or warm water, or if you turn on your car please remain inside your car and take the time to defrost windscreens thoroughly.
"Never leave your car unattended while it is unlocked or while the engine is running.
"Please also ensure that your tyres and wipers are adequate for cold driving conditions."
