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Anyone who regularly washes their car would notice that certain grimes like oil,
brake dust, iron filings, insects residue etc. can spread throughout the car,
but are hard to notice during wash and give a dull appearance when they are dry.
The sticky properties of clay can do a much through job at picking up
contaminants than normal scrubbing, and can make a real differences in the
appearance of your car.
How to use a clay bar:
1. Wash the car
2. Take a clay and flatten it out
3. Wet the area you want to clean with car shampoo mixed with water, waterless
wash or dedicated clay lubricant
4. Slide the clay up and down or left and right, not in a circular motion
5. Run your finger to feel how smooth the paint is after cleaning. 
6. Once the area done check the clay, fold the clay over on itself to have the
contaminants covered, then move onto another area
7. Change the clay when its no longer cleaning after folding
You can break the clay into half or smaller pieces to prolong its usage.