The super heated water or steam coming out of the pressure washer can soften the grease and let you easily wash it off with the highly pressurized water coming out of the washer. Some pressure washers are equipped with telescopic wand that will help you reach high walls and even clean the gutter without needing a ladder. This will also depend on your budget as well as your intention for using the machine. For normal household cleaning tasks, such as cleaning your car, the cold water model should be ideal for you. As mentioned before, they are inexpensive so if you are on a budget, this is the right pressure washer for you. Basically, there are three types of pressure washers according to the output temperature. You have the cold water, the hot water, and the steam pressure washers. Cold water pressure washers are great for minor cleaning jobs. If you are planning on taking on a much tougher cleaning job, your best choice would be the hot water or steam pressure washer. In Fact, 2500psi would be enough to strip off the paint from your car. If you plan on using the pressure washer indoors, then an electric pressure washer should be your choice. It s more expensive and less powerful than gas but it doesn t emit toxic fumes like gas powered pressure washers. But, if you want more power and you are somewhat on a tight budget and you only plan on using the pressure washer outdoors, then a gas powered pressure washer would be much more ideal for you. You can also use it to clean the siding. No matter the siding is, you can make it look brand new again by cleaning it with the pressure washer. Just remember that you shouldn t linger or get too close to the siding as the pressure coming out of the pressure washer can easily ruin the surface of the siding. However, although pressure washers will enable you to clean surfaces a lot easier, the power of the stream of water coming out of this machine can inflict damage if it is not used properly. This is why you have to learn a few techniques in using a pressure washer. Doing so will help in letting you do the job a lot quicker and you also won t risk injuring yourself or other people around you.