Its very easy to use. This how I do it. Wash the car and rinse off. Mould a piece of clay into the size of a 50p piece then spray a panel with lubricant, I use Meguiars quick detailer and rub the clay over the bodywork. I do it in straight lines but others may do it another way. If the clay gets dirty fold it over until you have a clean surface. Once I have done all the car including the windows I rinse the car off again. The bodywork should now be glass smooth ready for paint correction, sealant and wax. It can take a whole day for me to do my Focus if I'm doing wash, rinse, clay, rinse, paint correction, polish and wax. The first time you do it you will be amazed at how much muck comes off your paintwork.