A composite deck is a great place to relax, eat, and enjoy the outdoors. Over time, though, stains are hard to avoid. Food, grease, mould, or rust can leave marks on the surface. Regular cleaning keeps your deck looking its best.
This guide explains how to clean common stains, what tools to use, and how to stop stains before they happen.
Common Types of Stains
Composite decking is durable. But it can still stain. The most common stains come from:
- Food and drinks: Sauces, wine, and juice can leave marks if not cleaned quickly.
- Mould and mildew: These grow in damp, shady spots.
- Oil and grease: Outdoor cooking often leads to greasy spots.
- Rust: Metal furniture can leave rust stains if left too long.
Each type of stain needs a slightly different method to clean.
Tools You Will Need
Before cleaning, get a few simple tools:
- Soft-bristle brush
- Bucket
- Mild soap or composite-safe cleaner
- Clean cloths or paper towels
- Low-pressure hose or washer (optional)
Always check your deck’s care guide. Some brands may have specific instructions.
How to Remove Stains: Step by Step
Step 1: Know the stain
Look closely. Is it food? Grease? Mould? This helps you choose the right method.
Step 2: Clear the area
Move plants, furniture, or anything else out of the way.
Step 3: Sweep the surface
Brush off leaves, dust, or dirt before you start washing.
Step 4: Mix a cleaner
Use warm water with mild soap. For mould, mix in white vinegar. For grease, use a stronger deck cleaner if needed.
Step 5: Apply the mix
Pour or spray it onto the stained spot. Let it sit for a few minutes.
Step 6: Scrub gently
Use the brush to clean the area. Don’t press too hard. Avoid rough scrubbers.
Step 7: Rinse well
Wash off all cleaner using a garden hose. Leftover soap can leave marks.
Step 8: Repeat if needed
Tough stains may take more than one round.
Step 9: Let it dry
Leave the deck to air dry before putting things back.
How to Prevent Future Stains
Prevention is simple. Try these tips to avoid new stains:
- Sweep often
- Rinse the deck every few weeks
- Use mats under grills and furniture
- Trim trees and bushes to reduce fallen leaves
- Make sure water drains off the surface properly
Long-Term Deck Care
Basic care helps your deck last longer:
- Wash it deeply once or twice a year
- Check for loose boards or cracks
- Reapply a protectant if your brand recommends it
With the right care, your composite deck stays clean, strong, and ready for use year-round.
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