How do I know if it is gasoline or a natural gas leak?

Gasoline smells sharp and oily, like the pump, and you can usually find the liquid source such as a can, a mower, or a stain. Natural gas is scented like rotten eggs or sulfur, comes from a line or an appliance like a furnace or water heater, and there is no puddle to find. If you smell rotten eggs, or hear hissing near a gas appliance, leave the house right away and call your gas utility or 911 from outside. When in doubt, get out and let the utility check it.

Why does the gasoline smell keep coming back after I clean?

Because gasoline does not sit on top of a surface, it soaks in. Concrete slabs, carpet pad, drywall, and wood all absorb fuel and then off-gas it back into the air for days or weeks. If it got into an attached garage or near the furnace, your HVAC can also spread the fumes room to room. A surface wipe cleans what you see but leaves the fuel trapped in the porous layers underneath, which is why the smell returns the next morning.

Can a gasoline smell in the house be dangerous?

Strong, lasting gasoline fumes are both a health and a fire concern. The vapor is flammable and heavier than air, so it can build up low and near ignition sources like a water heater pilot or a furnace. Get the source outside, ventilate, and keep flames and sparks away. If the smell is intense, if anyone feels dizzy or nauseous, or if you cannot find where it is coming from, leave and call for help. And if the odor is rotten eggs rather than gasoline, treat it as a gas leak and call 911.

Gasoline Smell in the House: How to Get Rid of It

Specialty · By Odor Removal Experts · Updated June 2026 · Cleveland and Northeast Ohio

A gasoline smell in the house is the kind of thing you notice the second you walk in, and it does not fade on its own the way a cooking smell does. Usually it traces back to fuel that got spilled or stored somewhere it should not be. A leaky gas can in the mudroom, a mower or generator parked in an attached garage, a rag or a pair of shoes soaked at the pump, or fuel that seeped into the concrete and is now feeding fumes into the living space.

Before you clean anything, you have to be sure of one thing. Gasoline and natural gas are two different problems, and one of them is an emergency. This guide walks through how to tell them apart, where the fuel smell hides, why it lingers, and the steps that actually clear it at home.

The short answer

First, rule out a natural gas leak. A gasoline or petroleum smell is the sharp, oily fuel odor from spilled or stored gas. A rotten-egg or sulfur smell is a natural gas leak, so leave the house and call your gas utility or 911. Once you know it is gasoline, the fix is to find and remove the source, open the house up and ventilate, then treat the affected surfaces with a degreaser and baking soda. The fuel soaks into porous stuff and off-gasses for days, so plan on a couple of passes.

A rotten-egg or sulfur smell means a natural gas leak, so leave and call 911 or the gas utility.
A gasoline smell is spilled or stored fuel, most often from a can, mower, or generator kept indoors.
Get the source out of the house first, then ventilate hard before you clean anything.
Gasoline soaks into concrete, carpet, and drywall and keeps off-gassing, so surface sprays never last.

First, make sure it is gasoline and not a natural gas leak

This matters before anything else. Gasoline has a sharp, oily, solvent-like smell, the one you get at the pump. It comes from liquid fuel you can usually find and point at, like a can, a small engine, or a wet stain. Natural gas is different. Utilities add a chemical that smells like rotten eggs or sulfur so you can catch a leak, and that smell comes from a gas line, a furnace, a stove, or a water heater, not from a puddle you can see.

If the smell is rotten eggs or sulfur, or you hear a hissing near an appliance or gas line, treat it as a leak. Do not flip switches, light anything, or run fans. Get everyone out of the house, leave the door open on your way, and call your gas utility or 911 from outside. That is a safety call, not a cleaning job, and this guide does not cover it.

The rest of this is about the lingering petroleum smell that stays behind after the actual gasoline source has been found and removed.

Rotten eggs means leave now

If you smell rotten eggs or sulfur, suspect a natural gas leak. Do not touch light switches, appliances, or your phone inside. Walk out, leave the door open, and call your gas utility or 911 from outside or a neighbor's. Only come back when they say it is clear.

Find where the gasoline is coming from

Once you know it is fuel and not a leak, go find the source, because no amount of cleaning helps while it is still sitting there. Start with the obvious spots. An attached garage is the number one culprit. A gas can, a lawn mower, a snowblower, a generator, or a chainsaw stored inside all vent fumes, and even a can with a tight cap breathes a little. Those fumes drift under the door into the house, and if your furnace return is anywhere near the garage, the HVAC pulls them through every room.

Then check the places fuel gets tracked in or stashed. A mudroom or hall closet where boots and work clothes land. A basement or utility room where somebody set a red can down and forgot it. Carpet or a rug where a bottle tipped. Run your hand along baseboards and sniff low, because gasoline vapor is heavier than air and pools near the floor. On bare concrete, look for a darker stain that has soaked in, since that slab will keep gassing off long after the surface looks dry.

Get every fuel container, soaked rag, and pair of shoes out of the house and into a detached shed or open outdoor spot. Store gas cans outside the living space for good. That single move fixes a lot of these calls on its own.

Never store fuel indoors

A gas can belongs in a detached shed or a well-ventilated space away from the house, never in a mudroom, closet, or an attached garage that shares air with your living area. Approved sealed cans still off-gas, and the fumes are both a smell problem and a fire risk indoors.

How to get the gasoline smell out of the house

With the source gone, work the air and the affected surfaces in order. Do not machine-dry anything that touched fuel, and keep it all away from any flame, pilot light, or spark while you work.

Ventilate hard. Open windows and doors on opposite sides of the house and let it cross-breeze for hours. Box fans blowing out the windows push the fumes outside faster. If the smell came in through an attached garage, open that too and air the garage out separately.
Blot any liquid, do not rub. If there is still wet gasoline on carpet, a rug, or the floor, press clean rags or paper towels straight down and lift it. Rubbing drives it deeper into the fibers and the pad underneath. Bag the used rags and set them outside, since fuel-soaked cloth can ignite on its own.
Degrease the hard surfaces. Gasoline is an oil, so a grease-cutting dish soap in warm water breaks the film better than regular cleaner. Scrub concrete, sealed floors, and baseboards, then wipe with clean water. On a stained slab, a stronger concrete degreaser and a stiff brush work best, and it may take a few rounds.
Pull the odor with baking soda. Sprinkle baking soda over affected carpet, rugs, or the cleaned concrete and leave it several hours or overnight. It draws moisture and some of the oils up, then vacuum it out. A bowl of fresh baking soda left in the room helps too. Skip charcoal-briquette tricks and coffee grounds, which just add a second smell.
Wash the fabrics separately. Take fuel-soaked clothes, shoes, and towels outside to air first, then wash them alone in the hottest water the fabric allows with an extra degreasing detergent. Line-dry them outdoors. Do not put fuel-contaminated fabric in a hot dryer, since the heat and tumbling are a fire hazard.

When it is worth calling Odor Removal Experts

If you have pulled the source, aired the place out, and cleaned every surface you can reach, but the house still smells of gas a day or two later, the fuel has soaked into materials you cannot get to with a rag. Concrete wicks gasoline deep, carpet pad and drywall hold it, and once your HVAC has pulled the fumes through the ductwork, the smell spreads to rooms that never saw a drop. That is the point where DIY stalls and it makes sense to hand it off. A small can spill you can handle. A soaked slab, a smell that keeps coming back, or fumes moving through the whole house is our kind of job, and it is exactly what our gasoline and fuel odor removal service is built for.

We do not mask the smell and we never use ozone or chlorine. We break it down at the source with the right method for the situation. It starts with source removal and a deep clean to lift the bulk of the fuel residue. Enzymatic and oxidizing treatments go onto the affected surfaces to attack what is left. Thermal fogging and hydroxyl generators, which are safe to run while people are in the home, clear the air and the porous layers without any downtime. HEPA and activated-carbon scrubbing pull the airborne fumes, and we seal the spots where fuel has soaked in and cannot be flushed out. Most jobs wrap up in 1-4 hours.

Everything we use is green and non-toxic, so it is safe around kids and pets, and the home is safe to be in the moment we are done. We are same or next-day across Greater Cleveland and Northeast Ohio, our techs are fully insured and discreet, and the work is backed by a 100% guarantee. If the smell is not gone, we are not finished. Cost depends on how much fuel spilled and how deep it soaked, so we give you a straight number once we see it.