How to Clean CertainTeed Vinyl Siding
CertainTeed vinyl and polymer siding is low maintenance, but outdoor dirt, soot, chalk and biological staining still accumulate around shaded walls, ledges and landscaping. CertainTeed recommends soapy water—dish soap or common laundry detergent—a soft-bristle brush and a garden hose for general dirt. It specifically does not recommend power washing because high pressure can cause moisture intrusion, damage or discoloration. Cleaning solution should also be controlled around vents, fixtures and nearby surfaces. This guide covers common CertainTeed horizontal and board-and-batten vinyl or polymer siding; stone, fiber cement, painted trim and roofing require their own care instructions.
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Primary reference: CertainTeed official vinyl and polymer siding cleaning guidance. Always check the manual for your exact model.
Quick reference
- General method
- Mild soapy water, soft-bristle brush and thorough garden-hose rinsing.
- Work area
- Clean small shaded sections and protect openings, fixtures and nearby plants.
- Rinse direction
- Use gentle pressure across or downward, never driving water under panel laps.
- Stubborn stains
- Test a siding-compatible house wash and follow its dilution and contact time.
- Avoid
- Pressure washing, harsh mixtures, abrasives, upward spray and dried detergent.
What you will need
- CertainTeed's current siding care guidance and product identification
- A garden hose with a gentle spray setting
- A clean bucket
- Mild dish soap or common laundry detergent
- A soft-bristle siding brush
- A soft sponge and microfiber cloth
- Plastic sheeting or water-resistant covers for sensitive fixtures
- A stable extension tool rather than leaning a ladder against panels
Step-by-step instructions
Step 1: Confirm the cladding is vinyl or polymer
Identify the CertainTeed product and separate vinyl or polymer panels from painted trim, stone veneer, wood, windows and metal fixtures. Each adjacent material may have narrower chemical limits. Inspect for loose panels, cracks, open seams and existing water entry. Cleaning cannot correct damaged attachment or a leak behind the siding.
Step 2: Choose mild weather and prepare the area
Work on a cool overcast day or a shaded wall so soap does not dry onto warm panels. Close windows and doors, move furniture and cover electrical fixtures or other moisture-sensitive openings without blocking necessary ventilation permanently. Pre-wet or protect nearby plants and test runoff direction before mixing a full bucket.
Step 3: Remove loose debris gently
Brush cobwebs, leaves and dry dirt from panel laps and corners with a soft brush. Work without lifting the lower edge of a panel or pushing debris behind it. Do not scrape chalking or spots with metal. Dry debris removal keeps the wash solution cleaner and reduces the amount of repeated scrubbing needed on the finish.
Step 4: Mix the CertainTeed general-cleaning solution
Add a modest amount of dish soap or common laundry detergent to a bucket of clean water, following the detergent's dilution directions. CertainTeed identifies these mild soaps for ordinary dirt, grime, soot and chalk. Avoid perfume, dye or moisturizer additives near sensitive plantings, and never mix household chemicals or improvise a stronger bleach blend.
Step 5: Hand-wash one manageable section
Apply the soapy water by hand with a soft-bristle brush, sponge or cloth. Work in small sections with gentle strokes that follow panel orientation, giving shaded grooves extra attention. Do not wedge the brush into laps, vents or open joints. Keep the wall wet enough that loosened grime does not dry before rinsing.
Step 6: Rinse thoroughly with a garden hose
Use ordinary clean water at gentle hose pressure and rinse all soap from the cleaned area. Aim downward or across the face rather than upward beneath panel courses. CertainTeed says to avoid prolonged or high-pressure rinsing of open ventilated areas. Watch windows, soffits and fixtures so water does not enter openings.
Step 7: Treat stubborn staining with a compatible product
Repeat mild hand washing before escalating. For persistent algae, mildew or another named stain, use a house wash or specialized cleaner recommended for the siding and test it in a hidden place. Follow product dilution and contact time. Keep it off adjacent finishes and plants, and do not let it dry on the panels.
Step 8: Skip the pressure washer
CertainTeed does not recommend power washing vinyl or polymer siding because it can force moisture behind panels, damage the material or cause discoloration. A hose-connected house-wash product is the company's suggested alternative for stubborn dirt. Increasing nozzle pressure is not a substitute for controlled dwell time and soft hand agitation.
Step 9: Inspect the dry wall and restore the site
After the wall dries, check for remaining soap, streaks, loose edges and moisture around windows or fixtures. Repeat a gentle clean-water rinse where necessary. Remove temporary covers, rinse affected plants and clean tools. If stains quickly return from a leak, irrigation spray or overflowing gutter, correct that moisture source instead of repeatedly scrubbing siding.
Specific cleaning questions
Open a question for a concise answer about stains, odors, safety, frequency, and troubleshooting.