Best Proven Method: How to Get Tar Out of Deck Fast

Immediate Action (first 5 minutes)

If you just had your driveway sealed and the crew tracked black sludge everywhere, panic is your first instinct. Don't. I've cleaned up after sloppy roofers and paving contractors for over a decade. Tar is a petroleum-based nightmare, but it responds predictably if you catch it fast. The first 5 minutes dictate whether this is a 20-minute cleanup or a weekend-long sanding project.

First, stop walking. Every footstep drives the sticky asphalt deeper into the wood grain or composite grooves. Grab a plastic putty knife immediately. I keep a 3-inch Husky plastic scraper in my back pocket for exactly this reason. Metal will gouge your deck boards. Scoop up the thick, raised globs gently. You aren't trying to scrub yet. You just want to remove the 3D bulk of the spill.

Next, cool it down. Tar hardens when cold and turns to liquid when hot. If it's a 90-degree summer day, that tar is basically soup. Grab a bag of ice from your freezer. Dump it directly on the stain. Let it sit for exactly 3 minutes. The extreme temperature drop shocks the petroleum, making it brittle. Once it's brittle, snap off the remaining chunks with your plastic scraper. This immediate physical removal saves you from having to dissolve a massive puddle of chemicals later. I remember a job in July where a roofing crew dropped a five-gallon bucket of modified bitumen. The sun was brutal. The tar was practically boiling. We had to use bags of frozen peas just to get it to stop spreading.

What You'll Need (tools/products)

I'll be honest, this takes elbow grease and the right chemical allies. You can't just spray water on this mess. Over the years, I've tested dozens of solvents on pressure-treated pine and Trex composite. Here is the exact loadout I keep in my garage for tar extraction.

Item	Recommended Brand/Model	Estimated Cost	Why I Use It
Citrus Solvent	Goo Gone Pro-Power (32 oz)	$12 - $15	Breaks down petroleum without stripping wood stain.
Scrub Brush	OXO Good Grips Deck Brush	$18 - $22	Stiff enough for grime, soft enough to avoid scratching.
Utility Knife	Stanley FatMax Retractable	$10 - $14	For carefully slicing hardened surface crusts.
Absorbent Powder	Oil-Dri (5 lb bag)	$8 - $12	Pulls dissolved liquid tar out of deep wood pores.
Rags	Scott Shop Towels (Blue)	$15 - $20	They don't disintegrate when soaked in heavy solvents.

This isn't the cheapest option, but buying cheap brushes and weak solvents will just leave you with a smeared, sticky deck. Spend the $60 upfront. It saves hours of frustration.

Step-by-Step Removal

Now we get to the actual work. I recommend doing this on a cloudy day or in the late afternoon. Direct, blazing sunlight evaporates your solvents before they can penetrate the tar. Follow these exact steps to lift the stain without destroying your deck's finish.

Step 1: Score the Crust

If the tar has been baking in the sun for a few days, it forms a hard, rubbery shell. Take your Stanley FatMax utility knife. Hold it at a strict 15-degree angle to the wood. Gently score the surface of the tar blob in a crosshatch pattern. You just want to break the surface tension. Don't dig into the wood fibers. This creates micro-channels for your solvent to enter.

Step 2: Flood with Citrus Solvent

Pour the Goo Gone Pro-Power directly onto the scored tar. Don't spray it. Pour it. You need a thick, wet puddle completely covering the stain and extending half an inch past the edges. Let it sit for exactly 12 minutes. I set a timer on my phone. If you rush this, the solvent only softens the top layer, leaving a hard root underneath.

Step 3: Agitate and Lift

After 12 minutes, the tar should look like melted chocolate. Take your OXO deck brush. Scrub in tight, circular motions. Apply heavy downward pressure. You'll see the black sludge start to emulsify and turn into a milky brown foam. Keep scrubbing for about 3 minutes until the physical resistance drops significantly.

Step 4: The Powder Poultice Trick

This is my secret weapon for porous wood. When your landlord inspects next week, you don't want a faint gray shadow left behind. Sprinkle a heavy layer of Oil-Dri absorbent powder over the wet, scrubbed area. Press it down with your boot. The powder acts like a sponge, wicking the dissolved petroleum out of the deep wood grain as it dries. Leave it alone for 45 minutes.

Step 5: Sweep and Rinse

Sweep up the now-clumped, black powder. Throw it in a sealed trash bag. Next, mix 2 ounces of Dawn Ultra dish soap into a gallon of warm water. Mop the area to cut the oily residue left by the citrus solvent. Finally, rinse with a garden hose. Never use a high-pressure nozzle directly on the spot, or you'll blast the remaining tar deeper into the adjacent boards. If you notice any oily rainbow sheen on the water after rinsing, repeat the Dawn dish soap mopping step. You want the water to sheet off cleanly. Leaving solvent residue will attract dirt and pollen for the next month, turning your clean spot into a muddy magnet.

Alternative Methods

Sometimes the citrus approach doesn't cut it. If you're dealing with roofing pitch or heavily oxidized asphalt that's been there since last November, you need heavier artillery. I've tested these backups extensively.

Method 1: The Heat Gun Extraction

For composite decking like Trex or TimberTech, chemicals can sometimes leave a dull spot. Heat is a great alternative. I use my DeWalt D26960 heat gun. Set it to 750°F. Hold the nozzle exactly 4 inches away from the tar. Move it constantly in a figure-eight pattern. After about 45 seconds, the tar will blister and bubble. Immediately scrape it away with a wooden popsicle stick or plastic putty knife. The heat breaks the molecular bond to the composite shell. Wipe the remaining residue with a rag dampened with rubbing alcohol.

Method 2: Mineral Spirits for Stubborn Wood Stains

I'll be honest, mineral spirits smell awful and I don't love using them. But for raw, untreated cedar or pressure-treated pine, Klean-Strip Odorless Mineral Spirits work miracles. Dampen a blue Scott shop towel. Blot the tar aggressively. Do not rub. Rubbing spreads the black pigment. Blotting lifts it. Change your rag every three wipes. Once the tar is gone, you must immediately wash the wood with a TSP (Trisodium Phosphate) solution to neutralize the chemical and prevent the wood from drying out and splintering.

Method 3: The Freezer Trick for Small Items

If the tar is on a removable deck chair cushion or a small piece of trim, just put it in your chest freezer. Leave it at 0°F for four hours. The tar will freeze solid and snap off like glass. It's weird, but it works perfectly without any chemicals.

Prevention Tips

Cleaning tar is miserable. Avoiding it is smart. If you have kids who track mud everywhere, or if you live near a busy road where cars kick up fresh asphalt, your deck is a magnet. Here is how I protect my own outdoor spaces.

• Apply a Sacrificial Sealant: I re-seal my wooden deck every 18 months using Thompson's WaterSeal Advanced Natural Wood Protector. It fills the microscopic pores in the wood. When tar lands on a sealed surface, it sits on top of the polymer layer rather than sinking into the cellulose. It makes scraping 90% easier.
• Use Heavy-Duty Tarps During Projects: If contractors are working on your roof or driveway, lay down 6-mil polyethylene sheeting. Don't use the cheap 2-mil painter's drop cloths. Hot tar will melt right through thin plastic. Overlap the seams by 12 inches and tape them with Gorilla Tape.
• Keep a 'Spill Kit' Handy: Keep a bottle of WD-40 and a plastic scraper in your outdoor storage box. WD-40 isn't my first choice for deep cleaning, but for a fresh, 5-minute-old footprint, it stops the stain from setting while you gather your heavy-duty supplies.

Also, pay attention to your footwear. If you walk across a freshly sealed driveway, the soles of your shoes will pick up microscopic tar particles. Keep a pair of dedicated 'yard shoes' by the back door. Swap your work boots for them before stepping onto the wood. It sounds obsessive, but it saves me at least two hours of scrubbing every summer.

FAQ

Will tar ruin my composite decking?

Tar itself won't permanently destroy composite materials like Trex or Fiberon, but the wrong removal method will. Using harsh chemical paint strippers or metal wire brushes will void your manufacturer's warranty and leave permanent scratch marks. Always stick to plastic scrapers, heat, or mild citrus solvents to protect the protective polymer shell.

Can I use a pressure washer to blast off tar?

I strongly advise against using a pressure washer on fresh or semi-hard tar. The high-pressure stream (especially above 2000 PSI) will simply atomize the black sludge and blast it deep into the surrounding wood grain or composite grooves. You will turn one distinct blob into a massive, speckled gray shadow that is nearly impossible to fix.

Does white vinegar remove tar from wood?

White vinegar is fantastic for hard water stains and mildew, but it is completely useless against petroleum-based tar. Tar requires a non-polar solvent to break its molecular bonds, while vinegar is a polar, water-based acid. Save your vinegar for cleaning your glass patio table and buy a dedicated citrus or mineral solvent for the deck.

How long does it take for tar to permanently stain wood?

In my experience cleaning decks and tile for 10 years, raw pine will absorb the black pigments from tar in about 24 to 48 hours during hot weather. Once the oils penetrate past the first millimeter of the wood surface, surface scraping won't work. You will have to use a chemical poultice or physically sand the board down to bare wood.