And aim it away from people and pets. Paint sprayers can handle many different sizes of nozzle tip. Do a small section with the sprayer, then back-brush with a paintbrush or roller for an even finish. After around 20 minutes, check the areas that you have finished for puddles. If you see any, brush or roll those areas.
Washers designed for homeowners produce less pressure and reduce the chance of damage.
Many pressure washers allow you to apply cleaner through the wand. Or, apply the cleaner with a mop and bucket and work it in with a stiff-bristle broom. Airless paint sprayers like the one shown here require the right size tip for proper application. Check the finish label for the correct tip size. THE end grain - the area most vulnerable to moisture penetration.