More recently cement fiber siding which is sometimes confused with hardboard siding has become popular because it does not easily decay.
Power wash masonite siding.
However if not properly maintained it will deteriorate.
House siding collects a fine film of chalk and dirt and even if you can t see it it s important to remove it before you paint.
If you must pressure wash use low pressure from a distance and a mild house wash detergent.
If you do have masonite or hardboard siding it can and should be cleaned before painting it.
I would suggest wiping it clean.
Power washing is a quick effective way to clean a house if done correctly.
Masonite does not handle pressure washing well.
Masonite siding is extensively used in constructions.
How to power wash a two story house.
Add the mildew wash to a spray bottle and spray areas of the hardboard siding where the mildew stains appear.
Be sure all voids are caulked and sealed and keep water from getting behind the siding or in seams.
Here s a look at some of the common problems arising in masonite sidings and the ways to fix them.
Once you spray on the solution allow it to set in about 10 to 15 minutes and then use the hot water and laundry detergent solution to scrub away the mildew stains.