A clean composite deck makes your home look better and last longer. Taking care of these modern decks is different from caring for regular wooden ones. While composite decking needs less work than wood, you still need to clean it often to stop mold from growing and keep it looking nice.
According to Tim Gartland, president of the North American Deck and Railing Association, "Regular cleaning of composite decking is key to preventing stains and mildew. A simple cleaning two to three times per year can extend the life of your deck significantly."
Let's look at how to keep your deck looking great for many years to come through proper cleaning and care.
Protect Your Deck's Beauty

While maintaining a beautiful composite deck might seem intimidating, it's actually quite manageable with regular care and attention.
We recommend cleaning regularly to prevent buildup and maintain aesthetic appeal. Using a composite-specific cleaner or mild soap solution, we'll want to thoroughly rinse away cleaning agents after scrubbing.
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Let's explore what we need to do to keep our composite deck looking its best, along with some important things to avoid during cleaning.
We'll walk through each step of the cleaning process, from preparation to final rinse, making sure you have all the information needed for success.
As we wrap up, we'll share some final thoughts on maintaining your deck's beauty throughout the seasons.
Things to Do When Cleaning a Composite Deck
Cleaning a composite deck requires a systematic approach to guarantee ideal results and maintain the deck's appearance and durability. The process involves preparing the area, using the correct cleaning solution, and employing proper scrubbing techniques to remove dirt and grime effectively while protecting the composite material from damage.
- Remove all items from deck – Clear furniture, planters, and loose debris to create an unobstructed workspace.
- Mix cleaning solution – Combine composite deck cleaner with water in a 3:1 ratio in a bucket.
- Divide into sections – Break the deck into manageable areas to prevent cleaner from drying too quickly.
- Apply diluted cleaner – Use a spray bottle or pour solution directly onto deck surface.
- Wait briefly – Allow cleaner to sit for 30-60 seconds to penetrate dirt.
- Scrub thoroughly – Use nylon brush to clean with and against grain patterns.
- Focus on problem areas – Give extra attention to corners, edges, and heavily soiled spots.
- Rinse completely – Remove all cleaning solution with clean water.
- Allow proper drying – Let deck air dry fully before replacing furniture.
Things to Avoid When Cleaning a Composite Deck
When cleaning a composite deck, it's essential to use appropriate methods and materials to maintain its appearance and durability. Improper cleaning techniques can lead to permanent damage, voiding warranties and potentially requiring costly repairs or replacement.
Understanding what to avoid during the cleaning process helps preserve the deck's integrity and guarantees its longevity.
- Power washers exceeding 1,500 PSI – High-pressure water can erode and permanently damage the composite material.
- Bleach and acid-based cleaners – These harsh chemicals cause discoloration and breakdown of the deck's surface.
- Metal tools and abrasive brushes – Sharp or rough cleaning implements create scratches and permanent surface damage.
- Dragging furniture and heavy items – Moving heavy objects across the deck leads to unsightly scuff marks and scratches.
- Allowing cleaning solutions to dry – Dried cleaning products leave difficult-to-remove residue and can stain the surface.
- Direct heat or flames – Heat sources can warp or melt the composite material.
- Oil-based products – These can leave stains and create a slippery surface hazard.
- Undiluted cleaners – Strong cleaning solutions can damage the protective coating of composite decking.
Steps
Cleaning a composite deck requires a systematic approach to guarantee its longevity and maintain its appearance. A thorough cleaning not only removes surface dirt and stains but also prevents the growth of mold and mildew, which can damage the deck's material over time.
The process involves specific steps using the right cleaning solutions and tools to achieve ideal results while protecting the composite material.
Step 1: Remove all furniture, planters, and decorative items from the deck
Step 2: Sweep the entire deck surface to remove loose dirt, leaves, and debris
Step 3: Mix composite deck cleaner with water in a 5-gallon bucket (1:3 ratio)
Step 4: Divide the deck into manageable sections for cleaning
Step 5: Apply the diluted cleaning solution to the first section
Step 6: Let the solution sit for 30-60 seconds
Step 7: Scrub the section with a medium-stiff nylon brush
Step 8: Rinse thoroughly with clean water
Step 9: Remove standing water with towels or a sponge mop
Step 10: Repeat steps 5-9 for each remaining section
Step 11: Allow the deck to dry completely before replacing furniture
Final Thoughts
Maintaining your composite deck through regular cleaning guarantees its beauty and durability for years to come.
By following proper cleaning processes with appropriate deck cleaners, we're not just removing dirt and debris but also preventing mold and mildew growth.
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With proper cleaning and maintenance, your composite deck can remain beautiful and functional for many years to come.
Regular cleaning twice yearly, using the right cleaning solutions and tools, will prevent dirt buildup and protect your investment. Remember to always follow the manufacturer's guidelines, work in the direction of the grain, and rinse thoroughly after cleaning.
Maintaining your composite deck isn't optional – regular cleaning protects your investment and keeps it looking pristine for years.
Don't wait until your deck shows visible signs of wear or staining – establish a regular cleaning schedule and address spills and stains promptly.
By incorporating these cleaning practices into your home maintenance routine, you'll extend the life of your deck and maintain its original luster.
Take action today by inspecting your deck and planning your next cleaning session. Your outdoor living space deserves the attention, and the rewards of a well-maintained composite deck are worth the effort.