NBC News - If it’s not winter’s salt and grime, it’s mud and everyday dirt. Keeping your car clean can be a chore – a backbreaking one if you prefer to do it yourself.

But Nissan is testing a car that can keep itself clean, thanks to special paints that repel water and oils. Similar technology could eventually allow manufacturers to do away with windshield wipers by effectively fending off water, frost and grime. Meanwhile, new coatings can also help keep a car’s interior cleaner, something especially useful for parents – or those actively involved in sports like camping and trail biking.

The Nissan Technical Center in Rolle, Switzerland, is in the midst of testing a specially prepared version of the maker’s little European Note model. The subcompact hatchback has had a layer of a special coating, called Ultra-Ever Dry, applied over its conventional paint finish. Developed by UltraTech International, it’s technically known as a super-hydrophobic and oleophobic paint. In other words, it actually repels both oil and water.

That means that most common dirt, grime and oil won’t stick to the vehicle’s sheet metal. The Ultra-Ever Dry finish even works with rain, frost and sleet, Nissan reports, after preliminary testing.

"The Nissan Note has been carefully engineered to take the stress out of customer driving,” said Geraldine Ingham, the chief marketing manager for the hatchback. "We are committed to addressing everyday problems our customers face and will always consider testing exciting, cutting edge technology like this incredible coating application."

For the moment, the maker says it has no plans to offer the coating as a standard feature, but “will continue to consider (it) as a future aftermarket option.”

The maker did come up with another interesting paint technology a few years back, a self-healing paint. Dubbed Scratch Shield, it uses an elastic resin mixed into a conventional paint formulation that, when exposed to sunlight, would fill in small scratches within a matter of hours. Unfortunately, few motorists have been willing to pay the premium for the special formulations and Nissan now offers Scratch Shield in only a few markets and not the U.S.

The Japanese maker isn’t the only one looking at hydrophobic coatings – which could prove an interesting alternative for keeping windshields clear and clean. Italian designer Leonardo Fioravanti recently rolled out a wiper-less Hidra concept vehicle, which relies on both aerodynamic design to minimize what actually comes close to the windshield – and a special coating designed to keep things from sticking if they do come into contact with the glass.

Under a hydrophobic outer coat, a second, nano layer “pushes” dirt off to the sides, while a third layer essentially helps clean off grime. An additional, electrically conductive layer provides the power needed to make it all work.

The designers claim the technology behind the Hidra wiper-less windshield could prove reasonably cost-competitive and could wind up in production in a few years, marking the most significant improvement in rain gear since the first hand-operated wipers were introduced more than a century ago.

British sports car maker McLaren, meanwhile, has lifted a page from fighter jet construction. It is experimenting with a system that uses high-frequency sound waves to create a sonic barrier to prevent water and dirt from reaching the windshield.

Cleanliness is only one reason makers would like to eliminate the windshield wiper. The devices also create plenty of aerodynamic drag, which reduces a vehicle’s fuel economy.

Manufacturers also are looking at ways to keep things clean inside their vehicles. Most fabrics are now treated with dirt- and liquid-resistant coatings – or can be ordered with an optional treatment package. Ford says it also tries to design vehicles so it’s easy to wipe or vacuum food or spilled beverages out of cracks and crevices.

And to that effect, the new Honda Odyssey minivan this year began offering an optional, built-in vacuum cleaner tucked into its rear cargo compartment.

Of course, one challenge is to prevent messes in the first place, says General Motors, which has been conducting research on ways to keep passengers, especially children stuck in back seats known to industry engineers as “the puke zone,” from getting car sick.

“We know through other scientific research that even if our eyes are focused on a fixed point – if we can see the outside passing by in the window – our brain is telling us that we are moving,” explained Don Shreves, GM’s Human Factors engineering group manager said. “But if our eyes are at a downward angle and do not see the view outside the vehicle, our bodies become sensitive to motion and increase the chance of sickness.”

Among other things, the research has shown GM engineers that passengers are less likely to get sick when DVD screens are mounted overhead.