1)Direcltly use with water.No need any extra lubricate.
2)It can also rub off chemical substance
wash the vehicle thoroughly,do not use the clay bar until you have a very clean surface.Soak the clay bar in very clean,warm water to soften it. Knead the clay into a ball and then fatten it to create a palm sized disc. Keep the clay warm and soft during use.Lubricate the clay and 1 to 2 sqft of paintwork with clay lubricantor normal shampoo mixed with water.move the clay to straight lines up and down and then left to right over the lubricated area using only a light pressure. Once you have made a few strokes, the clay will start to glide and you will feel the difference between the treated and non treated surface . Ensure surface and clay are kept lubricated.Re-shape the clay at regular intervals to fully absorb dirt and maintain a clean face to work with. When a clean face can no longer be achieved discard the clay bar.Rinse off paintwork with clean water and dry using a microfiber polishing cloth.the paintwork will now feel silky smooth and can be polished if required. For lasting result the paintwork will need to be waxed to provide a superior shine and lasting protection.if the clay bar is dropped on the ground,it must be discarded immediately.