Tested & Proven Methods: How to Get Tar Out of Sink

By Elena Rodriguez · January 5, 2026

Immediate Action (first 5 minutes)

If you just finished re-roofing your shed and tracked sticky black gunk inside, panic is your first enemy. I've scraped tar off my own farmhouse sink more times than I care to admit after weekend DIY projects. The absolute worst thing you can do is turn on the hot water. Hot water melts the petroleum base. It turns a manageable solid clump into a smeared, sticky nightmare that coats your entire basin and seeps into the drain.

Instead, grab a plastic putty knife immediately. I keep a 3-inch Husky plastic scraper in my cleaning caddy specifically for these disasters. Gently scoop up the bulk of the tar. Don't press down hard. You want to lift it, not grind it into the microscopic pores of your sink's finish. Once the bulk is gone, run the cold tap. Keep the water temperature below 60°F. This keeps the remaining residue brittle and easy to chip away. Blot the area with a dry paper towel. Never rub. Rubbing just spreads the hydrocarbons across the surface. This initial five-minute triage saves you hours of frustrating scrubbing later.

What You'll Need (tools/products)

Tar is a petroleum byproduct, which means water and standard dish soap won't cut it alone. You need a solvent that breaks down hydrocarbon chains without destroying your sink's finish. In my 12 years of cleaning, I've tested dozens of commercial degreasers. Here is exactly what I keep under my sink for asphalt and tar emergencies.

Product	Best For	Price Range	Dwell Time
WD-40 Specialist Degreaser	Stainless Steel & Porcelain	$8 - $12	10 minutes
Goo Gone Pro-Power	Heavy, baked-on tar clumps	$10 - $15	15 minutes
Klean-Strip Mineral Spirits	Stubborn residue (Use with caution)	$12 - $18	5 minutes
Dawn Powerwash Dish Spray	Final emulsification and rinse	$5 - $7	2 minutes

Essential Tools

Plastic Putty Knife: Metal scrapers will permanently scratch porcelain and stainless steel. Spend the $4 on a plastic one.
3M Scotch-Brite Heavy Duty Scour Pad: The green side is great for stainless steel, but use the blue non-scratch pad for porcelain or fireclay.
Nitrile Gloves: Solvents strip the natural oils from your skin. I always wear 4-mil thick nitrile gloves to protect my hands.
Microfiber Cloths: You'll need at least three. Paper towels just shred and leave white lint stuck in the sticky tar.

Step-by-Step Removal (4-7 steps)

I'll be honest, this takes elbow grease. Tar is designed to withstand rain, sun, and heavy foot traffic, so it doesn't surrender easily. But if you follow this exact sequence, you'll have your sink looking brand new in about 20 minutes.

Step 1: The Cold Water Flush

Before applying any chemicals, make sure the sink is free of loose debris. Run cold water for exactly 60 seconds. This chills the tar and washes away any dirt or gravel that might act like sandpaper when you start scrubbing. Dry the stained area completely with a microfiber cloth. Solvents can't penetrate a layer of standing water.

Step 2: Apply the Solvent

Spray the tar stain generously with WD-40 Specialist Degreaser or Goo Gone Pro-Power. Don't be shy. You want the stain completely saturated. I usually apply about 2 ounces of product for a standard 6-inch tar smear. Now, walk away. Set a timer on your phone for 10 minutes. This dwell time is non-negotiable. The solvent needs time to break the molecular bonds of the petroleum. If you scrub immediately, you'll just push the tar around.

Step 3: The Gentle Scrape

After 10 minutes, the tar should look wrinkled and slightly dissolved. Take your plastic putty knife and hold it at a 45-degree angle. Push gently from the outside of the stain toward the center. You'll see the tar roll up into little black pills. Scoop these up and throw them in the trash. Do not wash them down the drain. They will harden in your P-trap and cause a massive plumbing headache.

Step 4: The Agitation Phase

Once the bulk is removed, you'll likely have a stubborn, shadowy outline left behind. Spray the area again with your solvent. Take your 3M Scotch-Brite pad and scrub in tight, circular motions. Apply moderate pressure. You should see the pad turning black. This is the emulsified tar lifting from the surface. Rinse the pad in a bucket of hot water every 30 seconds so you aren't just rubbing dirty foam back onto the sink.

Step 5: Emulsify with Dish Soap

Solvents leave behind an oily, slippery film that attracts dust. To fix this, spray the entire basin with Dawn Powerwash. The enzymes in this specific dish soap are incredible at breaking down the leftover petroleum residue. Let it sit for 2 minutes. Scrub lightly with a soft sponge, then rinse with warm water (around 100°F). The water should sheet off the sink perfectly. If it beads up, repeat the dish soap step.

Step 6: The Final Polish

For stainless steel sinks, I finish by buffing the area with a dry microfiber cloth and a single drop of mineral oil. This restores the shine and hides any micro-scratches. For porcelain, a quick wipe with Barkeepers Friend Soft Cleanser will bring back the brilliant white gloss. This isn't the cheapest option, but it works flawlessly every single time.

Alternative Methods (2-3 backup methods)

Sometimes you don't have commercial degreasers on hand, or you're dealing with a sink material that requires a gentler touch. When your landlord inspects next week and you need a miracle, try these backup strategies I've used in a pinch.

Method 1: The Peanut Butter Hack

This sounds crazy, but it actually works on small, fresh tar spots. Peanut butter is packed with natural oils that act as a mild solvent. Smear a thick layer of creamy peanut butter (not crunchy, the nuts will scratch) over the tar. Let it sit for 20 minutes. The oils slowly penetrate the asphalt. Wipe it away with a paper towel, then wash the sink with hot soapy water. It smells like a sandwich factory in your kitchen for a few hours, but it lifts the stain without harsh chemicals.

Method 2: Ice Cube Hardening

If you have a massive, thick glob of tar that won't budge, freeze it. Fill a Ziploc bag with ice cubes and place it directly on the tar for 15 minutes. The extreme cold makes the petroleum brittle. Once it's frozen solid, pop it off with your plastic scraper. It usually shatters and lifts right off the surface. I use this trick on my fireclay sink because it avoids chemical dwell times entirely.

Method 3: Baking Soda and Vegetable Oil Paste

Mix 3 tablespoons of baking soda with 2 tablespoons of cheap vegetable oil. Stir it until it forms a thick, gritty paste. Apply it to the tar stain and let it sit for 10 minutes. The oil breaks down the stickiness, while the baking soda provides gentle abrasion. Scrub with an old toothbrush in circular motions. This is my go-to method for composite granite sinks, which can be easily discolored by heavy-duty commercial solvents.

Prevention Tips

Dealing with tar is a miserable chore. It's sticky, it smells terrible, and it ruins sponges. In my experience, keeping it out of the kitchen sink entirely is the best strategy. Here are a few ways I prevent these disasters from happening in the first place.

Set Up an Outdoor Wash Station: If you're working with asphalt, roofing tar, or driveway sealer, never wash your tools or boots inside. I keep a plastic tub and a hose outside specifically for cleaning messy gear. It takes two minutes to set up and saves you an hour of scrubbing.
Use a Silicone Sink Liner: When you absolutely must wash something questionable inside, use a large silicone sink mat. These cost about $15 online and catch all the heavy debris. If tar gets on the mat, you can just take it outside and hose it off or throw it in the dishwasher.
Pre-Treat Work Clothes: If your teenager decides to wash their asphalt-stained work boots in the kitchen basin, stop them. Pre-treat heavy workwear with a heavy-duty laundry degreaser like Lestoil before it ever gets near the sink. Wash these items in a utility sink or at a laundromat.
Keep a Strainer in Place: A fine mesh stainless steel strainer catches small flakes of tar and gravel before they slide down the drain. Empty the strainer into the trash after every use.

FAQ

Will tar ruin my porcelain sink?

Tar itself won't permanently stain porcelain if you act quickly, but aggressive scraping can scratch the glossy finish. I always recommend using plastic tools and chemical solvents instead of metal scrapers to protect that delicate glaze.

Can I use bleach on tar stains?

Bleach is completely useless against petroleum-based stains like tar because it's a disinfectant, not a degreaser. You'll just end up with a harsh chemical smell and a sink that still looks like an asphalt driveway.

What if the tar goes down the drain?

If a large chunk washes down the pipe, immediately flush the drain with a gallon of boiling water mixed with half a cup of dish soap to keep it moving. If it hardens in the P-trap, you'll need to place a bucket underneath and physically unscrew the trap to dig the gunk out.

Is Goo Gone safe for all sink materials?

The standard citrus formula is generally safe for stainless steel and porcelain, but it can dull the finish on certain composite granite sinks. I always test a tiny drop in the back corner of the basin and wait ten minutes to check for any hazing before committing to the whole stain.