According to the experts at this old house it should be washed regularly to remove mildew dirt and oxidation.
Cleaning oxidation off aluminum siding.
Aluminum siding when exposed to air will oxidize and form a white powder like substance on the surface of the siding.
This oxidation is often transferred to the brick that surrounds the siding.
Keeping the surface clear of oxidation improves the looks and extends the life of all types of siding.
If you are cleaning an aluminum pot or pan rinse the pan under a strong jet of water.
Sometimes though stains develop that are hard to remove.
To clean aluminum siding start by mixing water liquid dish soap and white vinegar in a large bucket.
Metal wood vinyl cement fiber and composite siding are all subject to dirt and oxidation problems.
Vinyl is a siding material that is preferred by many homeowners because of its low maintenance and durability but vinyl siding and trim require.
Aluminum siding is a good kind of siding to have.
Give your aluminum siding a good rinse with the hose first.
Work in an area of about 10 to 12 feet wide.
If you are cleaning aluminum wheels or house siding use a damp cloth to wipe the aluminum or a hose to it with water.
If you don t have an extendable brush try attaching a car wash brush to the end of an extendable painting pole.
How to get oxidation off of an exterior vinyl trim.
Spraying at a downward angle prevents water from getting under the aluminum siding and causing problems underneath.
Then submerge a long extendable scrub brush in the cleaning solution.
Annual cleaning is the best defense.
Remove this oxidation with the proper chemicals and some hard work and your brick will look as good as new.
Step 1 rinse the vinyl siding using a garden hose.
I recommend using a spray nozzle with an angled setting and working from the top down.
Begin the process of cleaning oxidized aluminum by rinsing the aluminum to remove surface dust or debris.