You have probably been using pressure washing equipment even before you knew what to call it. Have you ever used a regular garden hose to wash your car? What about holding your finger over the end of a hose to cause the pressure to increase? Obviously one can remove more dirt and or grime with water of a higher pressure. That is the basic principle behind a pressure washer. The main difference is a power washing system is designed specifically to do all that work for you.
Pressure washing is good for removing hard and stubborn stains without damaging the surface of your valuables like your car or your rooftop. It works depending on the water pressure, the rate of flow of the water, the water temperature and the cleaning substance used. You can manipulate these elements to determine the efficiency of your pressure equipment.
Try comparing different levels of these elements and see which ones would yield the best results. For example, two hoses with the same water pressure would of course yield the same results. But try decreasing the rate of water flow on the other hose, while keeping the same pressure on the other one. Which do you think would clean more effectively? Of course you will see that the hose with high pressure and more water flow would clean out more dirt better and faster. Thus with this in mind, if you have lesser water flow, then you could increase the water pressure to compensate the decrease in the rate of water flow.
Another advantage of pressure washing is that it works well to clean hard to reach areas, like roof under-hangs or grids. That is why these are also used in cleaning surfaces with embossed areas or those with perforations. It would also be perfect for cleaning machines with smaller parts. You would find it convenient that you no longer have to take them apart in order to clean them properly.
As you can see pressure washing is very convenient to use. If you feel that you would not want to purchase a pressure washing equipment, you may want to consider hiring a pressure washing business to help you out. They could either offer pressure washing services themselves or they could rent out their equipment. Later on, you could then opt to buy a pressure washing solution for yourself.