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Use an extension pole for higher areas while keeping a downward angle. Allergens and harmful organisms such as mildew and algae accumulate on the surfaces of your house. If left untreated, they can create airborne mold spores, dust mites, and pollen that can trigger allergies in both children and adults. Remove any objects that are blocking the house (furniture, pottery, etc.), then use your plastic sheeting to cover anything that can’t be moved (doors, windows, etc.).
Hook up the pressure washer
Generally, you should plan to pressure wash or power wash a house once a year or every other year in the warmer months, usually between March and November. The weather is favorable and the sun is strong enough to dry the house before new debris can settle in the water droplets and adhere. It’s soft, so you shouldn’t use heated water, and you should begin with a low pressure and gradually increase it. It’s better to make several passes on a lower setting than one pass on a higher setting, which could crack or bend the siding. The immediate perimeter of the building will be flooded with water as the house is cleaned, and that water may have diluted cleaner in it.
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Get if you have a 2-story or 3-story house, or high walls in general. Use 2,000-3,000 PSI for most types of siding, like vinyl, brick and wood. To reach places over-head, plug a lance extension into your machine rather than using a ladder.

Other pressure washing tips:
Instead of relying on high pressure to clean a surface, soft washing relies more on the cleaning solution to do the work. Depending on what needs pressure washing and your experience level, some pressure washing tasks can be a DIY job. Often when houses get pressure washed, homeowners will get the gutters, driveway or fence cleaned at the same time. Each item will increase costs, but when packaged together you might receive those services for less than you would if you had them performed independently. Several things can affect the cost of pressure washing a house, like the size of the house, dirtiness, what you want cleaned and the time of year. The type of siding you have won’t impact the cost typically, but it will change how the house gets cleaned.
Visible Mold or Mildew
It will typically cost more than washing the siding or other parts of the home. However, it can be a great way to remove debris and mildew from the roofing material so that it can last for many years longer than if it were left to build up over the years. The average cost to pressure wash siding is $300 to $600, depending on the size of the house. This varies depending on the siding material, the cleaning method used (pressure or hot water power washing, chemicals, etc.), and other factors.
Cost to Pressure Wash a House by Material
Some homeowners may only want to wash their side of a fence or decide to share costs with a neighbor to have both sides pressure washed. Wood fences might require soft washing to prevent damaging the wood. Additional stories add linear footage to a pressure washing job and linear footage varies by house design. The cost to pressure wash a three-story, 3,000-square-foot home can rise to as much as $1,250. Homes with 2,300-square-feet typically cost $200 to $250, depending on linear footage. This task, however, is more involved than simply connecting your garden hose to a pressure washer and turning the water on.
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Thoroughly spray a section of a single floor of your home with the mildewcide solution. Starting from the bottom of the section and working your way up, gently but firmly scour the siding with a soft siding brush. Set up the pressure washer so it will be ready to go when you’re finished with the garden sprayer and scrubbing.
Pressure Washing Roof
And while you unintentionally ignore repairing these problems, they will result in more serious issues. Depending on the scope of the job, pressure washing could cost between $50 and $150 per hour. Although paint manufacturers might lead you to believe that the world will end if you don't clean the siding before painting, the reality is not quite that dire.
Pressure Washing vs Power Washing
The engine quietly hummed along and the wheeled base was easy to maneuver. If you don’t know how to use the equipment properly, you can do serious damage while power washing. Make sure you get a thorough demonstration of any rental equipment before leaving with it. And if you have purchased a power washer, read through the instruction manual before using it.
Learning how to pressure wash a house is an effective way to ensure your house looks its best, especially if you want to prepare it for a fresh coat of paint. You can purchase a pressure washer and accessories or browse rental options online. The good news is that water, generally, is fairly cheap, as in less than a penny a gallon. There are a number of variables, but assuming you use about 250 gallons of water to pressure wash your house, that would be somewhere around $1.25 worth of water.
In short, yes, you should pressure wash a house before painting it. Even if the exterior appears to be clean, it is almost certainly quite dirty, and paint will not adhere well to a dirty surface. What’s more, if you don’t wash the house first, you’ll trap all kinds of built-up grime and dirt in the paint, and your expensive, time-consuming paint job won’t look good. Follow the steps below, which start with spraying your house using a common garden sprayer and then move on to a pressure washer, to rid your home’s exterior of built-up grime. If you plan to rent a machine, the rental agent will be able to recommend an appropriate pressure washer for your job.
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5 Benefits of Power-Washing Your House.
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Direct the spray away from breakable objects like windows and outside lights, and remove house numbers and window boxes whenever possible. It can take 30 minutes to 3 hours or more to pressure wash a house, depending, of course, on how large the house is. A 2,500-square-foot one-story home might take around an hour, for example. In a 5-gallon bucket, mix the mildewcide (available at home centers or wherever you rent the machine) with water according to the manufacturer’s directions.
Included with the machine is an easy-connect spray gun with a steel tip and a 20-foot kink-resistant hose for those hard-to-reach places. And for extra ease, the machine comes with a removable container that attaches to the handle, to keep all the accessories in place. If you use too much pressure while power washing, you could punch a hole in vinyl siding, etch concrete, or splinter wood.
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