Wet a soft cloth with the cleaning solution and wipe the greasy stains.
How to pressure wash hardie siding.
Rub the oil or grease off the siding.
Create a gentle cleansing solution made of mild dishwashing soap and water.
Be sure to completely rinse it free of any soap residue.
From there rinse the area with clean water.
Mix a mild dish detergent and water in a bucket until you have sudsy water.
Pressure power washing.
Step 2 scrub the hardboard siding.
Using the high pressure spray nozzle attempt to remove as much dirt dust and grime as possible before cleaning with soap and water.
Attach the high pressure spray nozzle to your garden or water hose and rinse the hardboard siding area that you wish to clean.
This is one of the few ways that you can damage it.
You may need to repeat.
If using a brush brush the siding s surface dust or dirt then rinse the area with a garden hose.
Never start off on the highest pressure setting.
Rinse out your cloth in the bucket frequently to prevent grease and oil buildup.
Start from the top and clean with the direction of the siding.
Starting low and gently working your way up is the safest bet.
Do not use a high pressure hose to clean fiber cement siding.
If using a soft cloth wet the cloth then wipe the area in a side to side motion in the direction of the plank shingle or panel siding until clean.
Only use a pressure washer at a distance of 6 feet or more.
Use a side to side motion when cleaning horizontal planks.
Dip a soft cloth into the mixture and saturate it well.
Remember you still want to be careful so as not to damage the fiber cement siding.
Rinse the siding with a low pressure garden hose.