FISH slices, credits cards, CDs and pen knives are some of the bizarre objects company car drivers use to clear their windscreens of ice a new survey has found.

And fleets are being warned that drivers using strange objects for de-icing can create tiny scratches on windscreens that can prove hazardous, and ultimately lead to expensive window replacements.

RAC Auto Windscreens executives say that the scratches could potentially obscure a driver’s vision when they are hit by the glare of headlights from oncoming traffic.

Its winter vision survey also revealed that nearly a quarter of those surveyed admitted to breaking the law and driving with ‘porthole vision’.

The law states that all windows and mirrors of a vehicle must be clear and de-misted before starting a journey.