They are also inexpensive and very light in weight. However, if you are planning to use the machine for heavy duty cleaning, such as cleaning a building s concrete wall or to get rid of grease and grime stuck on your garage s floor, the heavy duty pressure washer would be your best choice. Another factor that you have to consider is if you need a cold water or hot water unit. To avoid doing so, you should direct the high pressure water spray over and away rather than directly through the joints and seams. To rinse, you have to start at the gutters and work your way down to the foundations. Rinsing the house means that you have to get the entire soap residue and dirt films off the house. The nozzle will determine the pressure, which is very much like putting your thumb on a garden hose. So, the smallest angle or opening will deliver more pressure or power. Next is to decide if you are going to use chemicals during the cleaning process. Most pressure washers have an injector or a special nozzle where you will be able to add detergents or chemical degreasers to the pressure spray. However, you have to remember that you shouldn t just use any type of pressure washer. You have to get the one that is designed to have features that will do the job well. It should provide you with super hot steam temperature, high flow rates and also high pressure levels. Having this kind of pressure washer will let you easily get unmatched degreasing results, which will eventually make the area you clean look like brand new. You may get tempted to wear your shorts and a pair of flip flops or your bathing suit when operating this machine but this is one of the things that you should never do when operating pressure washers. Wear goggles, ear plugs, boots, jeans, and raincoat. This will protect you from minute objects that may be propelled by the intense pressure. A pressure washer works by pumping water at high pressure and at different temperature levels. Depending on your needs, it can pump high pressure of cold water, hot water, or even steam across different types of surfaces. The high pressure will help wash away dirt, dust, stains as well as other impurities on any surface.