House siding collects a fine film of chalk and soil, and even in the event that you can not see it, then it is important to remove it before you paint. The best means to do this is to use a pressure washer. You may do this up to a month before you start painting.
Reasons to Pressure Wash
Pressure-washing not just removes the dirt and dirt that has collected in your siding, it also blows off flaking and loose paint that you would otherwise have to scrape off. Some pressure washers have a port for a low-pressure setting that allow you to take care of mold as you’re washing, therefore ensuring that the mold doesn’t return once you paint. You may pressure-wash most siding kinds, unless the home has a coat of lead paint. If so, you may need a contractor familiar with lead paint remediation.
Timing
When you schedule the painting job, remember that it may take your home a couple of days to dry once you pressure-wash it, then based on the siding material. Wood siding dries more slowly than vinyl or aluminum. If you can not get to the painting job immediately after washing, then don’t wait more than a month. If you do, sufficient dirt is very likely to gather to need another washing.