Claying is very very easy...
Just mist with the spray than go with clay bar...
Thoroughly wash and dry your vehicle. (To save time, many professionals clay the paint after the final rinse, while it's still wet).
Cut your clay bar into halves or thirds, so if you accidentally drop the bar (it will happen) you'll only lose a small portion. If a clay bar is dropped on the ground, it is contaminated and must be thrown away.
Always work on the vehicle in the shade, and out of the wind to save on lubricant. Spray the lubricant over a 2' x 2' area. Tuck the clay bar tucked into the palm of your hand and glide it across the lubricant.
I prefer back and forth movements to keep track of finished areas. If you are claying the entire vehicle, start from the top and work your way down to the lower sections. Use one side of the clay until it stops picking up the contaminants, and then turn it over to the fresh side.
When the second side is full of contaminants, you can knead the clay to produce two fresh surfaces. The average clay bar should clean 5 to 10 cars, depending on the amount of contamination.
Continue around the car until all painted surfaces have been clayed. You can also clay your glass, chrome, metal pieces and coated wheels. Your car should now be smooth and ready to be polished and waxed.
Tree sap mist
Hard water deposits
Diesel fuel exhausts
Rubber particles from other cars
And much more!