Expert Guide by 24×7 Deck Builders | Serving Dane County Homeowners
Composite decking makes outdoor living easy. With Deckorators and TimberTech composite boards widely used in Dane County homes, Wisconsin homeowners love the low-maintenance appeal. But here’s the truth: even composite decking needs care. Snow, leaves, grill grease, and the constant freeze-thaw cycles of Wisconsin weather can take their toll.
This expert-backed guide from 24×7 Deck Builders walks you through exactly how to clean composite decking, what materials to use, common mistakes to avoid, and how to preserve your deck’s longevity year-round.
Steps to Clean Your Composite Deck
Cleaning composite decking is simple when you follow the correct method. Whether it’s TimberTech or Deckorators, these steps help you preserve the appearance of your deck.
- Clear the deck of all furniture, flower pots, grills, and planters.
- Sweep off leaves, dirt, pine needles, and pollen using a stiff-bristle broom.
- Rinse the boards with a garden hose to loosen surface grime.
- Mix a cleaning solution — use warm water with mild dish soap or a composite deck cleaner (TimberTech DeckCleaner is a popular pick).
- Scrub with a soft-bristle brush, working with the grain of the deck boards.
- Rinse again thoroughly. Let no residue dry on the surface.
- Dry using towels or let the deck air-dry completely before resetting furniture.
Pro Tip for Wisconsin: Clean your deck during spring and fall when temperatures are mild. Snowmelt and freezing rain can complicate cleaning during winter months.
Materials to Use for Deck Cleaning
Using the right materials ensures that your composite surface doesn’t scratch, fade, or get damaged. Proper tools and non-abrasive cleaners will give your deck a deep clean without compromising its finish.
- Soft-bristled brush (or nylon deck brush for TimberTech)
- Bucket + measuring cup
- Mild dish soap or branded composite cleaner
- Garden hose with spray nozzle
- Protective gloves & goggles
- Pressure washer (optional, with max PSI of 1500–3100)
Pro Tip for Wisconsin: Never use bleach, ammonia, or harsh solvents — these can discolor or damage composite materials.
Common Issues & Cleaning Challenges in Dane County, WI
Composite decks are durable, but Dane County’s moisture and temperature swings present unique challenges. From tannin stains to hard water spots, knowing how to tackle each issue will extend your deck’s life and look.
- Mold & Mildew: Wisconsin’s damp, shaded yards are prime spots for mold. Scrub with a vinegar-water mix (1:4 ratio), rinse thoroughly.
- Grease & Food Spills: Barbecue stains are notorious. Wipe spills immediately, then clean with soapy water or deck cleaner within seven days to avoid permanent staining.
- Pollen & Sap: Spring allergens leave sticky messes. For a non-abrasive clean, use a soft brush and mild soap.
- Hard Water Stains: Rinse with white vinegar followed by filtered water. Avoid letting water dry on the surface — it can cause spotting.
- Winter Debris & Ice: Use plastic shovels with rounded edges. Avoid metal tools, which gouge the surface. Salt or calcium chloride can melt snow safely.
Common Challenges for Deck Maintenance in Wisconsin
The climate in our region demands a proactive deck maintenance strategy. In Dane County, seasonal debris, snow buildup, and intense summer UV can all contribute to wear and surface deterioration over time.
- Freeze-thaw cycles cause moisture to settle in crevices.
- Tree canopy coverage invites mold, tannin stains, and moss.
- Grilling & entertaining = higher risk of oil and food spills.
- Pollen blooms demand weekly sweeping in spring.
Pro Tip for Wisconsin: Homeowners near Lake Mendota or Monona should be extra cautious: lakeside humidity increases the risk of mildew.
Other Recommendations for Deck Maintenance
Maintenance doesn’t stop after cleaning — it’s about long-term protection. Smart habits and small precautions help avoid composite deck fading, mold growth, and surface scratches.
- Use furniture pads to avoid scratches.
- Add grill mats to block grease stains.
- Install awnings or pergolas for UV protection.
- Avoid sealing composite decks — capped boards don’t need it.
- For heavy damage, always consult a pro — replacing boards requires expert fit.
Composite Deck Cleaning FAQs
Use warm, soapy water and a soft-bristle brush. Scrub in sections, rinse thoroughly, and avoid cleaning in direct sunlight to prevent streaking.
Use a dedicated cleaner like TimberTech DeckCleaner or a mild soap-and-water mix. Avoid bleach or ammonia-based products.
Never use harsh chemicals, metal shovels, or stiff wire brushes. Avoid pressure washers above 3100 PSI and never use acetone.
Yes — but with care. Use a fan-tip nozzle, keep it at least 8 inches from the surface, and limit PSI to 1500–3100.
Yes. A diluted white vinegar mix (1 part vinegar to 4 parts water) works well on mildew and hard water stains.
Absolutely. Mix warm water with dish soap like Dawn® for an effective, eco-friendly cleaner.
Twice a year is the minimum; spring and fall are ideal if your deck is under trees or used frequently, and clean quarterly.
No. Deckorators and TimberTech boards come pre-capped with a moisture-resistant shell. Sealing is optional but not required.
Clean at least every 6 months, or more often if exposed to moisture, pollen, pets, or frequent grilling.
Grill grease, mold, tannins from leaves, sharp tools, bleach-based products, and heavy furniture dragged across the surface.
Use outdoor mats, install shading, sweep regularly, and treat spills immediately. Avoid harsh cleaners and protect from winter damage.
Why Dane County Homeowners Trust 24×7 Deck Builders
With years of hands-on experience in Wisconsin’s unique climate, 24×7 Deck Builders understands what it takes to protect and maintain composite decks. From local weatherproofing solutions to expert product knowledge, we’ve got Dane County covered.
While composite decking might be low-maintenance, it’s not “no-maintenance.” A little smart care goes a long way in protecting your investment. Follow the methods above and your deck will stay safe, strong, and stunning for years to come, no matter what the Wisconsin weather throws your way.
If you are unsure about whether your deck needs a little TLC or a complete rebuild, schedule a consultation. While we do not do small deck repairs, we will let you know if your deck requires serious work to make it safe.
