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.
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