As with every siding material there are three different kinds of buildup that can occur in your fiber cement siding.
How do you clean cement fiber siding.
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This is the easiest kind of buildup that you can clean as all you ll need to remove it is grab a soft cloth and a garden hose.
In cases of mold and mildew you need to take hold of a non toxic mold and mildew remover.
The first is dirt dust and chalk buildup.
Take your soft brush and use it along the siding to remove the dust or chalk that you want to clean.
The same procedure applies to cleaning oil or grease but with the use of a mild liquid dish soap.
Mix with water and use a pump spray to apply it to your fiber cement siding rinsing when done.
Spray an amount as indicated on the package onto a cloth or sponge and rinse away until there are no patches left on the surface.
Clean dirt dust and chalk.
Never use a hard or abrasive brush to clean cement fiber siding.