Car Cleaning Myth: Wax protection can be guaranteed to last up to one year

A claim may help sell a product, but Barry Meguiar says there are enough variables in place that make any such guarantees suspect.

A better strategy might be to consider those differences -- weather, use of road salt, whether your vehicle is parked outside or garaged -- and maintain accordingly. Meguiar's is taking that idea one step further with a personalized service that gives owners options based on their expectations.

Car Cleaning Myth: Diapers, t-shirts and flannel make good cleaning cloths

A smooth surface is exactly what you don't want to see in a cloth, the reason being those fine particulates that you're trying to capture.

While the cloth diaper or t-shirt may be clean, it's actually scratching the surface; a terrycloth premium microfiber towel is what's recommended, the deep pile surface creating a buffer zone that will pick up the bad stuff, not grind it into the paint finish.

Car Cleaning Myth: There is no difference between polishing and waxing

Understanding what polishing and waxing are designed to do is key. Polishing creates a brilliant high gloss surface; waxing protects the vehicle's finish by coating it with waxes polymers, resins and silicones. Which means waxing won't make a dull surface shiny.

Car Cleaning Myth: Waxing can remove swirl marks

Barry Meguiar says swirl marks, which are nothing more than scratches in the surface of a vehicle, can only be removed by getting to the bottom of it -- literally.

Today's modern paint finish actually magnifies the scratches, making swirl marks one of the more troubling aspects of maintaining a vehicle's finish. "We get more calls about swirl marks than anything else," says Meguiar.

Getting rid of them will depend on how deep the scratch is, with micro-fine, hairline scratches taken care of with a non-abrasive paint cleaner; moderate ones may require something a little more serious; even deeper swirl marks (caused by improper use of rotary buffers and rubbing compounds) may need professional color sanding and buffing.

Car Cleaning Myth: Clay bars should only be used by professionals

Remember how easy it was to use Silly Putty? Using a clay bar is just as easy, the bar (which comes in a kit) is able to grab and gently remove all bonded contaminants (like the tree sap and road rubber).

Car Cleaning Myth: If a car looks shiny, the cleaning process can be skipped

In this case, seeing is quite definitely not something you want to believe. "Your eyes can't tell you what's going on in the paint finish," says Meguiar, who suggests rubbing the face of your hand over the surface of the vehicle after a car wash.

"It should feel like glass if it's right. Most of the time it's going to feel more like sandpaper. You can feel the contaminants." Products like a clay bar can easily remove bonded contaminants, something that's essential before the application of a polish or wax.

Car Cleaning Myth: Washing and cleaning are the same

A car wash removes loose contaminants; cleaning removes stubborn stains, blemishes and bonded contaminants, explains Meguiar. Bonded contaminants? Think tree sap and, almost as bad, an aerosol spray of tire rubber that no one can escape.

"When you're driving behind someone, the rubber from the tires is landing somewhere -- and that's on your vehicle."