Proven & Easy: How to Get Tar Out of RV Siding Fast

Immediate Action (First 5 Minutes)

Stop. Don't touch it. I know the urge to grab a paper towel and scrub that black speck off your pristine white fiberglass is overwhelming. You need to resist. In my 12 years detailing motorhomes, I've seen rookies ruin a $4,000 paint job in exactly three seconds by dry-wiping fresh asphalt.

If you just drove through a fresh chip-seal zone in Texas, your rig is likely peppered with sticky black dots. These aren't just ugly. They contain harsh petroleum solvents that will literally eat through your RV's clear coat if left baking in the sun. When you notice tar splatter on your sidewalls or front cap, pull over safely and assess the damage.

Do not use your bare fingers. The natural oils and microscopic dirt on your skin will grind the tar deeper into the gel coat pores. Instead, grab a clean microfiber towel and gently dab the area to absorb any wet, dripping residue. If the tar is already hard and baked on, leave it alone until you get to your campsite. Trying to chip off cold, hardened tar with your fingernail will just scratch the surrounding clear coat.

Keep the RV out of direct sunlight if possible. Heat makes the tar softer, which sounds good, but it actually causes the petroleum binders to bleed into the fiberglass stain layer. I always try to park in the shade or wait until early morning to tackle this job. Patience saves paint.

What You'll Need (Tools & Products)

You can't just use kitchen degreaser on an RV. Household cleaners like Simple Green or Dawn dish soap will strip your wax and leave the gel coat completely unprotected. I've tested dozens of automotive and RV-specific solvents, and you need products formulated to break down asphalt without attacking vinyl decals or clear coats.

This isn't the cheapest option, but buying the right chemicals saves you from a massive buffing bill later. Here is my exact toolkit for tar removal.

Product	Best For	Price Range
Turtle Wax Bug & Tar Remover (16 oz)	Fresh tar on painted metal & clear coat	$8 - $12
Stoner Tarminator (15 oz aerosol)	Heavy, baked-on asphalt & sap	$15 - $20
Mothers California Gold Clay Bar Kit	Micro-tar specks & embedded grit	$20 - $25
Chemical Guys Premium Microfiber Towels	Safe wiping without scratching	$15 - $30 (pack)

You'll also need a bucket, a wash mitt, and a pH-neutral car wash soap like Meguiar's Gold Class. Don't skip the clay bar. I'll be honest, this takes elbow grease, but the clay bar is the only way to pull the microscopic tar shards out of the gel coat pores after the bulk of the mess is wiped away.

Step-by-Step Removal Process

Follow this exact sequence to protect your RV's exterior. Rushing this process is how you end up with dull, scratched panels that require professional wet sanding.

Step 1: Wash the Surrounding Area

Never apply tar remover to a dirty surface. If there is dust or sand on the sidewall, your towel will drag those abrasive particles right through the clear coat. Mix 1 ounce of Meguiar's Gold Class soap into a 5-gallon bucket of cool water. Wash the affected panel using a clean microfiber wash mitt. Rinse thoroughly with a hose, but do not dry the panel yet. The water acts as a temporary lubricant.

Step 2: Apply the Tar Solvent

Shake your can of Stoner Tarminator or Turtle Wax remover well. Spray the product directly onto the tar spots. If you are dealing with a large splatter zone, work in small 2x2 foot sections so the chemical doesn't dry out. Let the solvent sit for exactly 3 to 5 minutes. You will see the black tar start to bleed and turn brown. This means the petroleum bonds are breaking down.

Step 3: Wipe Gently in One Direction

Take a clean, plush microfiber towel and fold it into quarters. Wipe the tar gently in one direction. Do not scrub in circles. Circular scrubbing creates swirl marks that catch the sunlight and make your RV look terrible. Flip the towel to a clean side after every single wipe. If the tar is stubborn, spray more solvent and wait another 3 minutes. Never force it.

Step 4: Decontaminate with a Clay Bar

Once the visible tar is gone, run your hand inside a plastic sandwich bag over the fiberglass. If it feels rough like sandpaper, you have embedded micro-tar left over. Spray a generous amount of clay lubricant (or diluted car wash soap) onto the panel. Knead the Mothers clay bar into a flat patty and glide it back and forth over the rough spots. The clay will pull the remaining asphalt out of the pores. Wipe dry with a fresh towel.

Step 5: Restore the Protection

Tar solvents and clay bars strip away all your existing wax. Your gel coat is now completely naked and vulnerable to UV oxidation. Apply a high-quality synthetic sealant like Collinite 845 Insulator Wax. Put a dime-sized drop on a foam applicator pad and rub it in using overlapping circles. Let it haze for 10 minutes, then buff it off. This seals the pores and makes future tar removal much easier.

Alternative Methods for Stubborn Tar

Sometimes you are boondocking in the desert and don't have your professional detailing kit with you. If you're parked at a crowded campground and the guy next door is backing up his truck, kicking fresh asphalt onto your rig, you have to improvise. Here are three backup methods I've used in a pinch.

The Peanut Butter Trick

This sounds crazy, but the natural oils in creamy peanut butter break down asphalt binders surprisingly well. Smear a thick layer of cheap, generic peanut butter over the tar spot. Let it sit for 15 to 20 minutes. The oils will soften the tar enough for you to wipe it away with a paper towel. I'll be honest, this smells awful and takes extra cleanup time with dish soap, but it works in an emergency.

WD-40 Multi-Use Product

Almost every RVer keeps a can of WD-40 in their basement storage bay. Spray it directly onto the tar and let it penetrate for 5 minutes. Wipe it away gently. WD-40 is highly effective on fresh tar, but it leaves a very greasy residue that will attract dirt for weeks if you don't wash it off immediately with a strong degreaser. Keep it away from your rubber window seals, as it can dry them out over time.

Heat Gun for Thick Globs

If you drove behind a commercial roofing truck and got hit with massive, thick globs of hot asphalt, solvents won't penetrate the center of the blob. Use a heat gun set to a low temperature, around 150°F. Hold it 6 inches away from the tar and keep it moving constantly. Once the tar gets gooey, gently scrape it off with a plastic razor blade. Never use a metal blade on fiberglass.

Prevention Tips for the Road

Removing tar is a pain. Preventing it is much easier. After dealing with hundreds of ruined front caps, I've put together a few strategies to keep your rig clean on the highway.

• Install Heavy-Duty Mud Flaps: If you tow a trailer or a dinghy vehicle, install Rock Tamers or similar heavy-duty mud flap systems. They hang low and catch the asphalt kicked up by your tires before it hits your RV's front wall. They cost around $250, which is cheaper than a single paint correction job.
• Apply a Ceramic Coating: Products like Gtechniq Crystal Serum create a hydrophobic, ultra-slick barrier on your fiberglass. Tar simply cannot bond to a ceramic-coated surface. When you get hit, the tar usually washes right off with a standard pressure washer rinse. This isn't the cheapest option, but it lasts up to 5 years.
• Maintain Safe Following Distances: Stay at least 150 feet behind dump trucks, paving crews, and flatbeds carrying construction equipment. If you must pass, do it quickly and move over a full lane to avoid the debris spray zone.
• Keep a Quick Detailer in the Cab: Keep a bottle of Meguiar's Quik Detailer and a microfiber towel in your driver's seat pocket. If you get hit while driving, pull over at the next rest stop and wipe it off while it's still fresh and soft.

Frequently Asked Questions

Will WD-40 damage my RV decals?

WD-40 is generally safe for short-term use on most modern vinyl RV decals, but it can leave an oily residue that attracts dirt. I always recommend testing it on a hidden corner of the decal first and washing the area thoroughly with dish soap afterward. Leaving it to bake in the sun for days might cause the vinyl edges to lift or peel.

Can I use a razor blade on fiberglass?

Absolutely not. Fiberglass and gel coat scratch incredibly easily, and a metal razor blade will leave deep, permanent gouges that require wet sanding to fix. Stick to plastic razor blades or your fingernail for scraping, and let the chemical solvents do the heavy lifting.

How often should I reapply wax after tar removal?

Tar removers and clay bars strip away your existing protective wax layer, leaving the gel coat completely exposed to UV rays and oxidation. You must reapply a high-quality paste wax or synthetic sealant immediately after finishing the tar removal process. I personally re-wax the treated panels the exact same day to prevent water spotting.

What if the tar got on my EPDM rubber roof?

Do not use petroleum-based tar solvents on an EPDM rubber roof, as they will dissolve the membrane and cause massive leaks. Instead, use a dedicated rubber roof cleaner like Dicor's EPDM cleaner and a soft-bristle brush to gently agitate the spot. If the tar is deeply embedded, you may need to carefully cut it out and patch the area with Dicor lap sealant.