CREDIT cards, CDs, pen knives and even a fish slice are among the items drivers admitted to using to clear ice from their windscreens, according to RAC Auto Windscreens.

The vehicle-glazing expert warned that these objects can create tiny scratches on the windscreen which could prove hazardous.

Scratches on a windscreen can obscure a driver’s vision when they are hit by the glare of headlights from on-coming traffic.

Nearly a quarter (24 per cent) of those surveyed admitted to breaking the law and driving with porthole vision.

By law the windows and mirrors of a vehicle must be clear and de-misted thoroughly before you set off on your journey. Drivers who ignore the law are risking a £1000 fine for driving with restricted vision.

Chris Bonsall, RAC Auto Windscreens technical and safety manager, said: "As well as breaking the law you are endangering the life of yourself and other motorists if you drive with restricted vision.

"Why put yourself and others at risk for the sake of getting up a few minutes earlier in the morning and investing a few pounds on an ice scraper and can of de-icer?

"If you don’t, it could be a hefty fine or, worse still, a 14-year prison sentence if you cause a death while driving with restricted vision."