How to Guide
USTB 20 | Version 2 | PAGE 1 of 2
For complete installation information visit
www.JamesHardiePros.com
TECHNICAL BULLETIN
Cleaning James Hardie
®
 Primed and 
ColorPlus
®
Technology Siding 
NOVEMBER 2018
#20
This cleaning instruction applies to all James Hardie
®
 products, including factory-primed products and ColorPlus
®
 Technology.
Always follow the instructions and precautions outlined in the James Hardie ColorPlus
®
 Technology literature that was supplied with the product and the 
information that is available on the James Hardie website (www.jameshardie.com), including James Hardie ColorPlus Technology instructions and precautions.
The extent and nature of the maintenance required will depend on the geographical location, the exposure of the building and whether your product is 
factory-primed or ColorPlus product. Cleaning, as needed, is recommended to remove dirt, dust, chalking, oil, grease, organic contaminants, or mold that may 
build up on the product surface over time. Dust from cutting and construction dust should be removed IMMEDIATELY upon installation (refer to the cleaning 
instruction in the table below). During cleaning, always wear appropriate protection (gloves and eyewear) and shield any landscaping or vegetation.
Surface cleaning recommendation is given below for specific product conditions. (Please note that damage to siding arising from improper cleaning or 
maintenance may not be covered by the James Hardie warranty).
RECOMMENDATION
CONSTRUCTION/CUTTING/ 
EXISTING DIRT AND CHALK
OIL, GREASE OR OTHER 
ORGANIC CONTAMINANTS
MOLD AND MILDEW
TOOLS
Soft cloth, soft all paint poly brush or chip brush 
or horsehair bench brush, garden hose. (Do not 
use hard brush (for example, scrub brush or an 
abrasive scrub sponge) that could damage the 
finish or siding. 
Soft cloth and garden hose. Soft cloth or soft 
sponge and garden 
hose.
SOLUTION
Water Mild liquid dishwashing soap 
(Dawn
®
, Ivory
®
, or Joy
®
 ) and 
water. Do not use any harsh 
cleaning chemicals.
Mildew cleaners 
(Jomax
®
, Mildew 
Check
®
, Mold Armor
®
) 
and water.
METHOD
1. If using a brush, brush the product surface 
dust, dirt or chalk, then rinse the area with a 
garden hose. 
2. If using a soft cloth, wet the cloth then wipe the 
area until clean and rinse the area with clean 
water. Rinse the cloth frequently.
1. Use soft cloth wetted with 
soapy water to clean the area. 
Rinse the cloth frequently.
2. Use a garden hose to rinse the 
area.
1. Follow the mildew 
cleaner instruction.
2. Lightly scrub the area 
with mildew.
3. Use garden hose to 
rinse the area.
SOFT ALL PAINT BRUSH CHIP BRUSHHORSEHAIR BRUSH SIDING BRUSH


