At times, the best electric pressure washer can cause havoc. Sometimes the best pressure washer can cause cuts in the concrete and the surrounding material. If this happens in vinyl or cedar, their effects can be frustrating. But this can be avoided if you are a bit careful. Understand the psi of your pressure washer and adjust your distance from the washing surface so that the pressure of the water stream falling on the wall is maintained at an optimum level. You can also adjust the nozzle so that it does not make the stream sharp. Avoid lower angle water streams with your best electric power washer.