A thorough scrubbing is a must before painting any exterior surface.
Painting exterior siding without pressure washing first.
However most painting contractors like myself include pressure washing as part of entire exterior painting job.
It digs holes in the surface and furs the wood grain up damaging the siding.
True most pressure washers are powerful enough to take off paint but for best results stripping should be a separate step done with a scraper sander or heat gun after the process of washing.
The same thing goes for dirt and dust.
Paint applied to dirty siding will adhere in the short term.
As an experiment rub a clean white cloth across the unwashed siding.
It removes the dirt and broken down paint residues that keep fresh coats from adhering and gets rid of mildew that grows on paint in all but the most arid climates.
When pressure washing a lot of painters will get right up close to the surface to try to blast loose paint off.
The point of pressure washing your house siding prior to painting is to wash it not to strip the paint.
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But over the years your house will experience paint failure faster than if it were applied to clean siding.
When you schedule the painting job keep in mind that it may take your house two or three days to dry after you pressure wash it depending on the siding material.
If you still want your exterior walls cleaned before painting but do not want to pressure wash yourself you might call a local painting contractor.
Hopefully this helps you cleaning walls before painting exterior of your home.
If you see grey spores or green growth on your home you may have a mildew or mold problem.
Wood siding dries more slowly.
Taking this from an expert in the field giving you first hand knowledge how an exterior paint reacts painting over outside wood trim and siding.
They often succeed and then that 3000 psi water is blasting right into bare wood.
The cloth will likely come up dark gray with a layer of fine soot.
Washing your house exterior without a pressure washer siding gutters windows pavement decorating projects although cleaning siding and sidewalks isn t the most glamorous of house projects a little water and the right tools can go a long way toward improving your curb appeal.