McKee's 37 Universal Clay Lubricant - 16 oz.

Wash and dry your vehicle first. Spray a 2 square foot area with Universal Clay Lubricant. Lightly rub the clay bar across the wet surface. It will grab inititally. This indicates that the clay is removing contaminants. When the clay glides freely the surface is completely clean. Wipe the area with a clean soft microfiber towel. You may need to mist  the area again to remove any clay residue. Always follow with a coat of wax or paint sealant.