7 Ways to Remove Pine Sap from Composite Decking

Pine sap can be a sticky nuisance, especially when it finds its way onto your beautiful composite decking or outdoor furniture. Left untreated, the sap can harden and become challenging to remove, leaving your deck looking less than pristine.

While removing pine sap from composite decking can feel frustrating, don’t worry. There are several ways to safely and effectively remove it without causing damage, as well as preventing it from becoming a recurring issue. If you’re also dealing with sap on your wooden deck, we’ll cover how to handle that, too!

1. Rubbing Alcohol or Hand Sanitizer

One of the simplest ways to remove sap from composite decking is by using rubbing alcohol or hand sanitizer. 

Here’s how to do it:

• Apply a small amount of rubbing alcohol or hand sanitizer directly to the stain.
• Let it sit for a minute to start breaking down the sap.
• Gently scrub the area with a soft cloth or sponge in a circular motion.
• Rinse the area with warm water and dry with a clean cloth.

This method is easy to apply, effective for smaller sap stains, and works well on composite and wooden decks. Just be cautious; don’t overdo it, and avoid rubbing too hard, as it can cause light surface scratches.

2. Ice and Scraping

If the sap has hardened, using ice to freeze it can make it easier to remove. This quick, water-based, low-cost method is particularly useful for stubborn sap spots that won’t come off with simple cleaners.

Here’s how to do it:

• Place an ice pack or ice cubes directly on the sap and let it sit for a few minutes.
• Once the sap is frozen, use a plastic scraper (avoid metal scrapers to prevent damaging the decking) to gently lift the sap from the surface.
• Clean the area with a mild soap and water solution to remove any residue.

This method is great for sap that’s hardened over time. It works well for composite decking and minimizes the risk of scratching the material.

3. Vinegar and Baking Soda

For a more natural solution, vinegar and baking soda are excellent options for tackling sap stains. These everyday household items effectively break down sap and are safe for the environment and your deck.

It is important to observe the area after cleaning to see if the sap has been completely removed.

Here’s how to do it:

• Mix a small amount of baking soda with vinegar to create a paste.
• Apply the paste to the sap stain and let it sit for 10-15 minutes.
• Scrub the area gently with a soft-bristle brush or sponge.
• Rinse the deck with warm water and dry thoroughly.

This method is ideal for composite decking because it’s gentle and is a great go-to solution if you prefer natural cleaning agents.

4. Commercial Deck Cleaners

If you’re dealing with multiple sap stains or a particularly stubborn spot, a commercial deck cleaner designed for composite materials might be the best solution. These cleaners are formulated to lift sap, grease, and other tough stains without harming your deck. 

Here’s how to do it:

• Follow the manufacturer’s instructions on the cleaner, paying attention to recommended dilution rates.
• Apply the cleaner to the sap-stained area.
• Allow the solution to sit for the recommended time.
• Scrub with a soft brush, working the cleaner into the stain.
• Rinse thoroughly with water.

A commercial cleaner is a more powerful option, especially for larger decks or stubborn stains. Be sure to choose a cleaner that is safe for composite decking to avoid damaging the material.

5. Mineral Spirits

Mineral spirits are another effective option for removing pine sap from composite decking. When used properly, this solvent dissolves the sticky residue without damaging the deck’s surfaces.

Here’s how to do it:

• Apply a small amount of mineral spirits to a clean cloth.
• Gently rub the sap-stained area, being careful not to oversaturate the surface.
• Allow the solution to break down the sap.
• Wipe the area clean with a damp cloth and then dry it thoroughly.

While mineral spirits can be very effective, it’s important to test the results of this method on a small, inconspicuous area of your deck first to ensure there’s no discoloration or damage.

6. WD-40

For another quick fix, WD-40 can work wonders on sticky sap spots. The lubricant breaks down sap residue and makes it easy to wipe away without the product harming your composite decking.

Here’s how to do it:

• Spray a small amount of WD-40 directly on the sap stain.
• Let it sit for a minute or two.
• Wipe away the sap with a soft cloth.
• Clean the area with mild soap and water to remove any oily residue.

WD-40 is safe for composite decking when used in moderation, and it’s a fast way to deal with stubborn sap spots. As with any cleaner, it’s a good idea to apply it on a small area first and test it.

7. Power Washing

If your composite deck is covered in sap or other stains, power washing can be an effective way to clean a larger surface area. However, you should proceed with caution, as high-pressure washing can damage composite decking (and wood decking) if done incorrectly.

Here’s how to do it:

• We recommend starting your power washer at a low-pressure setting. However, please check with your manufacturer for the recommended pressure settings.
• Hold the nozzle at least 8-10 inches away from the deck to avoid damaging the surface.
• Use smooth, sweeping motions to remove sap and other debris.
• Allow the deck to air dry or wipe down with a clean cloth.

Power washing is an excellent option if you’re dealing with widespread sap stains or other dirt that’s accumulated on your deck. Just be sure to use the appropriate settings.

How to Remove Sap from a Wooden Deck

If you’re dealing with sap stains on a wooden deck, the methods above can also apply, though you may need to adjust your approach slightly depending on the type of wood. Wooden decks tend to be more sensitive to moisture and pressure, so be sure to:

• Test solutions on a small area first to ensure they don’t damage or discolor the wood.
• Avoid high-pressure washing if possible. Because pressure washers can damage wood docks, it is best to use a regular garden hose. If you use a pressure washer, use a fan tip nozzle to reduce the force of the water. Hold the tip about one foot away from the dock and keep the pressure at or below 600 PSI.
• Use wood-specific cleaners if your deck has a particular finish or stain.

Preventing Sap Buildup

While there are many ways to remove sap from composite decking, the best approach is to prevent it from accumulating. Here are some tips for keeping your deck sap-free.

Trim Nearby Trees

If you have pine trees near your deck, consider trimming them back to minimize the amount of sap that can fall on your deck.

Install a Deck Cover

Adding a cover or pergola can shield your deck from falling sap, leaves, and other debris.

Regular Cleaning and Staining

While composite decking is generally low-maintenance, if you have pine trees nearby, you’ll want to inspect your deck regularly for pine sap. Cleaning your deck periodically and when you notice any sap can prevent it from hardening and becoming more difficult to remove over time.

By taking these preventative measures, you can save yourself the hassle of removing sticky sap and keep your composite deck looking clean and new for years to come. Regular cleaning and staining can also help protect your deck from harmful UV rays, preventing color loss and graying.

Wood Treatment and Protection

Something else we recommend for wood decks is sealing. Decks & Docks has tested just about every wood treatment on the market, and we know what works in the harshest environments.

For ipe and hardwoods, we recommend Penofin Hardwood Formula—an oil-based finish specially formulated to penetrate dense hardwoods while allowing the wood’s natural beauty to show through.  

For pressure-treated decking, our go-to is Spa N Deck from Flood or Wood RX. This 100% acrylic finish formula allows you to clean, prep, and finish your deck or dock all in one day. We carry it at all our Decks & Docks locations and online at The Deck Store.

Upgrade Your Deck with Lumber From Decks & Docks

Pine sap still got you down? Time to make some home improvements? Check out our extensive collection of lumber products at Decks & Docks! From composite decking to natural wood to pressure-treated lumber to specialty hardwoods and softwoods, we’ve got it all and can help you decide what’s best for your deck or dock project! Upgrading your deck can transform your patio into a beautiful, functional outdoor space.

If you’re ready to enhance your outdoor space or need advice on the best decking materials, visit us at one of our nationwide locations or give us a call. We have everything you need, including hardware and accessories, to create a beautiful outdoor oasis with a deck that’s built to last. Decks & Docks are what we do best!