First of all, you'll need to be prepared with waterproof clothing, especially a good pair of boots. Once you have connected the hose to the power washer's inlet, turn on the water supply and plug the cord into an outlet. It is important not to turn on the motor before turning on the water tap, as this may damage the pump.
In some cases it is a good idea to add detergent for deeper cleaning. To achieve this you will need to fill a bucket with the solution and let the hose suction from there.
Remember to maintain a 45-degree angle to help loosen the dirt. It is important to keep in mind not to bring the tip closer than 30 centimetres so as not to damage the surface you are cleaning. Finally, be sure to keep the power cord away from water to avoid electric shock.