Proven: How to Get Grease Out of Deck Easily (2026)

Immediate Action (First 5 Minutes)

Spilled burger grease on the patio? Don't panic. I've ruined my fair share of cedar planks during summer cookouts. Because of this, I know exactly how fast oil seeps into porous wood or composite materials. You have a tiny window before that grease sets into a permanent dark spot. Grab paper towels immediately. Blot the spill. Never wipe or rub the grease. Rubbing just pushes the oil deeper into the wood grain or the textured grooves of your Trex decking.

Next, cover the wet spot with an absorbent powder. I keep a box of cornstarch in my grill caddy specifically for this. Cat litter works too. However, cornstarch is finer and gets into the micro-pores much better. Leave it there for at least 15 minutes to draw out the surface oil while you gather your heavy-duty cleaning supplies. If you're dealing with a massive spill from a dropped tray of ribs, use a plastic putty knife to gently scoop up the excess fat before applying the powder. Speed is your best friend here.

What You'll Need (Tools and Products)

Getting oil out of outdoor flooring requires more than just dish soap and a prayer. I've tested dozens of degreasers over the last decade. Some strip the finish right off your composite boards. Others do absolutely nothing to aged pine. Here is my exact toolkit for tackling stubborn BBQ drips.

Item	Purpose	Estimated Cost	My Top Pick
Heavy-Duty Degreaser	Emulsifies animal fats and cooking oils	$10 - $15	Krud Kutter Original
Stiff Bristle Brush	Agitates cleaner deep into wood grain	$20 - $30	Libman 48-inch Deck Brush
Absorbent Powder	Draws liquid oil out of surface pores	$5 - $8	Cornstarch or Oil-Dri
Pump Sprayer	Applies cleaning solution evenly	$15 - $20	Chapin 1-Gallon Sprayer

Let's break down these tools. First, you need a heavy-duty degreaser. I highly recommend Krud Kutter Original or Simple Green Oxy Solen. They cost around $10 to $15 a gallon and cut through animal fats without bleaching your wood. Next, grab a stiff bristle brush. Don't use a flimsy dollar-store broom. You need a 10-inch deck brush with 4-inch stiff polypropylene bristles, like the Libman model. It gives you the physical force needed to scrub deep into the grain. For the absorbent powder, standard cornstarch is great for fresh spills. For older, set-in stains, I use Oil-Dri granules. Finally, a Chapin 1-Gallon Pump Sprayer saves your back from bending over to apply the cleaning solution.

Step-by-Step Removal (The 5-Step Method)

This is the exact process I use when clients call me to rescue their outdoor living spaces after a messy holiday weekend. It works flawlessly on pressure-treated lumber, cedar, and capped composite decking.

Step 1: Sweep and Clear the Area

Remove all patio furniture, planters, and grill accessories. You need unobstructed access to the stain. Sweep away loose dirt, leaves, and pollen. If you have kids who track mud everywhere, hose off the surrounding area first so you don't create a muddy paste while scrubbing the grease. A clean workspace makes the chemical reaction much more effective.

Step 2: Apply the Absorbent Poultice

For fresh stains, your initial cornstarch application might be enough. For older stains, mix cornstarch with a little bit of mineral spirits to form a thick paste. Spread this paste over the grease spot. Make it about a quarter-inch thick. Let it sit for 30 minutes. The mineral spirits break down the hardened oil, while the cornstarch pulls it out of the wood fibers. This two-pronged attack is crucial for aged drips.

Step 3: Agitate with a Stiff Brush

Scrape off the dried poultice with your plastic putty knife. Now, spray your Krud Kutter degreaser directly onto the stain. Grab your Libman deck brush. Scrub the area using tight, circular motions. I'll be honest, this takes elbow grease. You need to scrub for a full 3 to 5 minutes to force the degreaser into the pores. Don't just brush the surface; press down hard.

Step 4: Let the Degreaser Dwell

This step is where most people fail. They scrub and immediately rinse. Don't do that. Let the degreaser sit on the stain for 10 to 15 minutes. The chemicals need time to emulsify the fat molecules. Keep an eye on it. If the sun is beating down and the cleaner starts to dry, mist it lightly with your pump sprayer. Never let the degreaser dry completely on the deck, as this can leave a cloudy residue.

Step 5: Rinse with High Pressure

Attach a Gilmour adjustable nozzle to your garden hose. Set it to a flat, strong stream. Rinse the area thoroughly, pushing the suds and dissolved grease away from the house and into your yard. If a faint shadow remains, repeat steps 3 through 5. Most stains will vanish completely after the second pass.

Alternative Methods (Backup Plans)

Sometimes the standard degreaser route doesn't cut it. Maybe the grease has been baking in the July sun for three weeks. Or maybe you're dealing with a delicate wood species like Ipe that reacts poorly to harsh alkaline cleaners. I'll be honest, these backup methods take a bit more time, but they absolutely save the deck.

Method 1: The TSP (Trisodium Phosphate) Soak

TSP is a heavy-duty cleaner you can find at any hardware store for about $12. It's incredibly effective on porous wood. Mix half a cup of TSP powder into one gallon of warm water (around 90°F). Wear heavy rubber gloves and safety goggles. TSP is caustic. Apply the solution to the grease stain with a stiff brush. Let it dwell for 20 minutes. Scrub aggressively, then rinse thoroughly. TSP will strip away dirt and grease, but it might slightly lighten the wood, so you may need to apply a deck brightener afterward.

Method 2: Poultice with Acetone and Talc

This is my secret weapon for capped composite decking like TimberTech. Composite boards can melt or warp if you use harsh solvents directly on them. Instead, mix acetone with talcum powder to create a thick, frosting-like paste. Apply it to the grease stain and cover it with plastic wrap. Tape down the edges. Leave it overnight. The acetone flashes off slowly, dissolving the oil, while the talc absorbs it. The next morning, scrape it off and wash with mild soap. This method protects your composite warranty.

Method 3: Sanding and Re-sealing (The Last Resort)

If the grease penetrated deep into raw, unsealed pine, no chemical will pull it all out. You have to remove the wood fibers. Use an orbital sander with 80-grit sandpaper. Sand only the stained board, following the wood grain. Once the dark spot is gone, switch to 120-grit to smooth it out. You'll need to re-stain or seal that specific board to match the rest of the patio. This isn't the cheapest option, but it guarantees a perfect finish when all else fails.

Prevention Tips

Nobody wants to spend their Saturday scrubbing patio boards. After hosting a dinner party where someone inevitably knocks over a plate of fatty sausages, you'll wish you had taken these precautions.

• Invest in a Grill Mat: I use the GrillTex Protective Mat (around $40). It catches dripping fat before it ever touches your deck boards. Make sure it extends at least 12 inches past the front and sides of your grill.
• Apply a Penetrating Sealer: Products like Thompson's WaterSeal create a hydrophobic barrier. When grease hits the sealed wood, it beads up on the surface instead of soaking in. Reapply every two years for maximum protection.
• Clean Grates Before Moving: People often drag greasy grates across the deck to clean them. Always scrape your grates while they are still hot and over the grill's drip tray before moving any parts.
• Use a Splash Guard: If you must grill on the wood, place a metal splash guard behind and beneath the cooking grates to catch flying oil droplets.

FAQ

Will a pressure washer remove grease from my deck?

A pressure washer will blast away surface dirt, but it won't dissolve grease. In fact, the high PSI can drive the oil deeper into the wood grain or gouge your composite boards. Always use a chemical degreaser to break down the fat molecules before rinsing with a standard garden hose.

Can I use Dawn dish soap to clean grease off composite decking?

Dawn is great for fresh, light splatters, but it struggles with heavy, baked-on animal fats. For a quick fix, mix a few drops of Dawn into warm water and scrub. For serious BBQ drips, you need a dedicated outdoor degreaser like Krud Kutter to fully emulsify the stain.

How do I get old, black grease stains out of wood?

Old stains have oxidized and trapped dirt, turning black. You'll need to use a TSP (Trisodium Phosphate) solution or a commercial deck brightener containing oxalic acid. Apply the chemical, let it dwell for 20 minutes, scrub hard, and rinse. You may need to sand the board if the stain has penetrated too deeply.

Does baking soda work on deck grease stains?

Baking soda is a mild abrasive and works okay on smooth surfaces like concrete. However, it doesn't pull oil out of deep wood grain or composite grooves very well. Cornstarch or commercial oil absorbents are much finer and far more effective at drawing out lipids from porous materials.