How to Remove Stubborn Stains from Your Deck

A deck is a great outdoor extension of your home, providing a space to relax, entertain, and enjoy nature. However, over time, decks are prone to stains from food spills, mildew, rust, grease, and even hard water. Whether you have a wood or composite deck, knowing how to remove stubborn stains will help maintain its beauty and longevity.

This guide will walk you through effective methods to tackle the most common deck stains and keep your deck looking spotless year-round.

General Cleaning Tips

Before tackling specific stains, start with a basic cleaning routine:

1. Sweep the Deck – Remove dirt, leaves, and debris to prevent staining.

2. Rinse with Water – Use a garden hose or pressure washer (on a low setting) to loosen surface grime.

3. Use a Mild Soap Solution – Mix dish soap with warm water and scrub the deck with a soft-bristle brush.

4. Rinse Thoroughly – Avoid leaving soapy residue, as it can attract more dirt.

For tougher stains, follow the targeted stain removal methods below.

How to Remove Different Types of Stubborn Stains

1. Grease and Oil Stains (From BBQs, cooking spills, etc.)

For Wood Decks:

• Sprinkle baking soda or cornstarch over the stain to absorb the grease.

• Let it sit for 15-30 minutes, then scrub with a damp brush and mild dish soap.

• Rinse thoroughly with water.

For Composite Decks:

• Use a degreaser (like Dawn dish soap) mixed with warm water.

• Scrub gently with a soft brush and rinse with water.

• Avoid harsh chemicals, as they may damage composite decking.

2. Mildew and Mold Stains

For Wood Decks:

• Mix one part vinegar with three parts water and apply to the affected area.

• Scrub with a stiff-bristle brush and let it sit for 15 minutes.

• Rinse with water.

• If mildew persists, use a wood deck cleaner with oxygen bleach.

For Composite Decks:

• Use a mixture of water and mild detergent.

• Apply a hydrogen peroxide-based cleaner for stubborn mildew.

• Scrub with a soft-bristle brush and rinse thoroughly.

3. Rust Stains (From metal furniture, nails, or tools)

For Wood Decks:

• Use a lemon and salt mixture (sprinkle salt over the stain and squeeze lemon juice on top).

• Let it sit for 5-10 minutes before scrubbing.

• Rinse with water.

For Composite Decks:

• Apply a mild vinegar solution (50/50 mix of white vinegar and water).

• Scrub gently with a soft brush and rinse.

• Avoid abrasive cleaners that can scratch the composite surface.

4. Food and Beverage Stains (Wine, coffee, ketchup, etc.)

For Wood Decks:

• Blot spills immediately to prevent deep staining.

• Use a baking soda and water paste, apply to the stain, and scrub gently.

• Rinse thoroughly with water.

For Composite Decks:

• Use a mild soap and warm water solution.

• Scrub with a soft-bristle brush and rinse well.

• If needed, apply a specialized composite deck cleaner.

5. Hard Water and Mineral Deposits

For Wood Decks:

• Mix equal parts vinegar and water.

• Apply with a sponge, let sit for 10 minutes, and rinse.

For Composite Decks:

• Use a mixture of white vinegar and dish soap.

• Scrub lightly and rinse with clean water.

6. Paint or Stain Spills

For Wood Decks:

• If the paint is still wet, blot (don’t rub) with a cloth.

• If dried, use a paint remover or sandpaper (test in an inconspicuous spot first).

• Rinse with water.

For Composite Decks:

• Use a plastic putty knife to scrape off dried paint.

• Apply rubbing alcohol or a composite-safe cleaner.

• Wipe clean and rinse.

Preventing Future Stains

• Apply a Sealant (For Wood Decks) – Helps repel stains and water damage.

• Use Protective Mats Under Grills – Prevents grease and oil stains.

• Wipe Spills Immediately – Reduces the chance of deep stains.

• Regular Cleaning Schedule – A quick rinse and scrub every few weeks keep stains from setting.

Conclusion : Remove Stubborn Stains from Your Deck

A well-maintained deck enhances the beauty of your outdoor space and increases your home’s value. By using the right cleaning techniques for your deck material, you can easily remove stubborn stains and prevent long-term damage. Whether dealing with grease, mildew, rust, or food stains, these solutions will help you keep your deck in top condition year-round.