Originally Posted by andrew
To use Cleaner Clay, work on a clean vehicle in a shady area, on a cool paint surface. Spray a 1 ft square area with lubricant and rub the bar lightly back and forth. It will grab at first, but keep rubbing. Keep the surface wet/lubricated. When the bar glides freely, the surface is clean. Wipe away any residue with a microfiber towel and move on to the next section. Store your clay bar by wetting it with lubricant and sealing it in a plastic bag in its original jar.
Just keep spraying the bar (and the car) with the Quick Detailer to keep it gliding on the car so you don't get clay marks. Don't be afraid to utilize meguiars.com also

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You'll be able to tell when it's working because it will probably sound and feel like sandpaper at first, and then a few rubs later its smoother to the touch than you ever knew was possible!