Proven Ways: How to Get Tar Out of Backpacks Fast

By Marcus Chen · December 29, 2025

Immediate Action (first 5 minutes)

When your teenager drops their $120 North Face Recon on a freshly sealed driveway, your heart sinks. I've been there. Don't grab a paper towel. Rubbing is the worst thing you can do because it forces the sticky hydrocarbons deep into the complex nylon weave of your expensive gear. You have about five minutes before the volatile compounds evaporate and the tar cures into a hardened shell.

Grab a dull plastic edge. I always use an expired credit card or a plastic spudger. Scrape off the raised globs gently. Work from the outside of the stain toward the center to prevent spreading. Next, isolate the bag. Put it in a large plastic trash bag. Throw it in your chest freezer. Set the dial to 0°F. Leave it alone for at least 45 minutes. This rapid temperature drop makes the tar brittle. It stops the bleeding.

It helps to know what you are dealing with. Driveway sealcoat is thin and spreads rapidly. Roofing tar is thick and clumps. Pine tar from trees is highly sticky but responds much better to alcohol-based solvents. Identifying the source dictates your secondary attack plan.

What You'll Need (tools/products)

I've ruined two canvas messenger bags testing harsh chemicals over the years. Acetone melts polyurethane coatings. Bleach destroys Cordura fibers. You need targeted solvents that break down petroleum without eating synthetic threads. Here is my exact toolkit for this job.

Tool / Product	Purpose	Estimated Cost
Goo Gone Automotive Spray Gel	Breaks down asphalt and tar bonds	$8 - $12
Dawn Platinum Powerwash	Emulsifies leftover oily residue	$5 - $7
Nikwax Tech Wash	Restores DWR water-repellent finish	$15 - $18
Chemical Guys Horsehair Brush	Agitates fabric without fraying threads	$10 - $14
Meguiar's Supreme Shine Towels	Traps dissolved particles in waffle weave	$15 (pack of 3)

I highly recommend the automotive version of Goo Gone over the standard citrus formula. The gel clings to vertical surfaces. It won't run down the backpack and stain the bottom panel. You'll also need a plastic drop cloth. Working on a concrete driveway without a drop cloth will result in the bag picking up fresh dirt. A 9x12 foot plastic sheet from Home Depot costs about $4. It keeps your workspace sterile.

Step-by-Step Removal

Step 1: The Freeze and Snap

Pull the backpack out of the freezer. You need to work fast. The tar will start softening at room temperature within three minutes. Take your plastic scraper. Snap off the brittle chunks. They should pop off like hardened sap. If it smears, put it back in the freezer for another 20 minutes.

Step 2: Solvent Application

Lay the bag flat on your plastic drop cloth. Spray the Goo Gone Automotive directly onto the remaining stain. Saturate it completely. Let it sit for exactly 8 to 10 minutes. I've timed this extensively. Less than eight minutes and it won't penetrate the weave. More than twelve minutes and it starts drying out.

Step 3: The Agitation Phase

Take your horsehair brush. Scrub in tight, overlapping circles. Apply moderate pressure. You'll see the tar turning into a dark, muddy sludge. Wipe the sludge away with a clean microfiber towel. Fold the towel frequently. You don't want to redeposit the tar back onto the fabric. Repeat the spray and scrub process if a dark shadow remains.

Step 4: Emulsification and Rinse

Now you have a greasy ring. This is where the Dawn Platinum comes in. Spray it directly on the oily spot. Massage it in with your fingers for 60 seconds. Rinse the area with lukewarm water. I use a garden hose with a gentle spray nozzle. The water should be around 85°F. Cold water won't activate the surfactants. Hot water can warp synthetic zippers.

Step 5: Interior Bleed Check

Tar is notorious for wicking through heavy fabrics. Flip the backpack inside out. Inspect the inner lining. If you see a dark shadow, you must treat the inside too. Spray a light mist of solvent on the interior spot. Blot it with a dry towel. Never scrub the interior lining. It's usually a thin polyurethane coating that tears if you look at it wrong.

Step 6: DWR Restoration

Solvents strip the factory Durable Water Repellent coating. Once the bag is clean, wash the entire pack in a front-loading washer using Nikwax Tech Wash. Use a gentle cycle. Hang it to dry in a shaded, well-ventilated garage. Direct UV rays degrade wet nylon. It takes about 24 hours to dry completely.

Alternative Methods

Method 1: WD-40 Specialist Heavy Duty Degreaser

Don't use standard WD-40. The standard formula leaves a terrible fishy odor that lingers for months. The Specialist Degreaser costs about $10-14. It uses water-based solvents. Spray it on. Wait five minutes. Wipe it away. It's highly effective on polyester blends. I always test solvents on the bottom corner of the bag first. If the color transfers to your towel, stop immediately.

Method 2: Creamy Peanut Butter

I'll be honest, this takes elbow grease and smells weird. But it works in a pinch. The natural oils in Jif creamy peanut butter break down the tar's bonds. Smear a thick layer over the stain. Let it sit for 30 minutes. Scrape it off. You must wash the bag immediately afterward. Otherwise, you'll attract ants and leave a massive grease stain.

Method 3: 91% Isopropyl Alcohol

This is my go-to for small pine tar splatters. Dip a cotton swab in the alcohol. Dab the tar spot. The alcohol dissolves the sap quickly. It evaporates in seconds. This method won't work for large, palm-sized asphalt smears. It dries too fast to penetrate deep fabric weaves.

Prevention Tips

If you have kids who track mud and construction debris everywhere, prevention is key. I treat all my hiking packs with Scotchgard Heavy Duty Water Shield. A 10oz can costs about $18. It creates a slick barrier. Tar struggles to bond to the treated fibers. Apply it twice a year. When you're packing for a weekend camping trip, inspect your gear before loading the car. Also, teach your family to drop bags on a designated indoor mat. Never toss them on the driveway after a fresh sealcoat job.

FAQ

Will acetone ruin my backpack?

Yes, it almost certainly will. Acetone dissolves polyurethane and melts synthetic nylon threads on contact. I've seen it burn permanent holes through expensive camping gear in seconds. Stick to citrus-based or water-based degreasers instead.

Can I just put it in the washing machine right away?

No, the heat and agitation will bake the tar into the fabric permanently. The washing machine will also get coated in sticky black residue. This will ruin your next three loads of laundry. Always freeze and scrape the bulk of the stain first.

What if the tar is on the mesh back panel?

Mesh is incredibly fragile and snags easily. Do not use a stiff brush on the ventilation mesh. Use a soft toothbrush and gently dab the solvent. If the tar is wedged deep in the mesh holes, use a wooden toothpick to carefully pick it out after freezing.

Does this work on vintage canvas rucksacks?

It works, but canvas is highly porous and absorbs liquids rapidly. You'll likely need to repeat the solvent application three or four times. Be prepared to use a heavy-duty canvas cleaner afterward to lift the deep-set oil stains from the thick cotton fibers.