Removing Previous Tenant Odors—A Complete Guide to Rental Odor Solutions

Why Previous Tenant Odors Remain

When you move into a rental property, it's not uncommon to notice odors left behind by the previous occupant. The most common culprits are:

• •Cigarette smoke odors: Smoke seeps into wallpaper, ceilings, carpets, and air conditioning filters
• •Pet odors: Cat and dog body odors, urine, and feces can linger in tatami mats and gaps in flooring
• •Cooking odors: Oil, spices, and fish aromas cling to kitchen walls and range hoods
• •Mold and moisture odors: Mold develops in closets, bathrooms, and cupboards
• •General living odors: In long-term rental situations, body odor and sweat can seep into soft surfaces like wallpaper and flooring

Even if a cleaning company has worked on the space, these odors may not be completely eliminated. Cigarette smoke and pet odors in particular are difficult to remove, and wallpaper replacement or ozone treatment may be necessary for a complete solution.

How to Check for Odors Before Moving In

During your apartment viewing, keep these odor-checking tips in mind.

Inspection methods:

• •Enter the room with windows closed and use your nose to check for odors first (ventilation can mask smells)
• •Check inside closets, cupboards, bathrooms, and around kitchen range hood covers
• •Open air conditioning filter covers and smell inside (with permission)
• •Look for wallpaper discoloration and nicotine stains on ceilings

If you notice concerning odors during your viewing, it's important to ask your landlord or property manager before signing the lease: "Could you tell me what cleaning has been done?" or "I've noticed some odors—would you be able to address this?"

Consulting with Your Landlord or Property Manager and Requesting Repairs

If You Discover the Problem Before Moving In

If you find odor problems before taking the keys, you can request cleaning to be done before you move in—such as re-cleaning, wallpaper replacement, or ozone treatment—as a condition of the lease. Landlords often want to avoid vacant periods, so they may be willing to negotiate.

How to approach the conversation:

• •"During my viewing, I noticed quite a bit of [cigarette/pet] odor. Would it be possible to address this before I move in?"
• •"Specifically, I'd appreciate having the air conditioner cleaned and the walls cleaned."

If You Discover the Problem After Moving In

If you discover that previous tenant odors are a problem after moving in, it's crucial to note "odors present" in your move-in inspection report. If documented, you can later claim that the odors were pre-existing, not caused by you.

However, to get your landlord to cover odor removal costs after move-in requires invoking contract law's warranty that the rental is habitable and fit for normal use. Resolving this legally is often difficult, which is why confirming the condition before moving in is so important.

DIY Odor Removal Methods

If negotiations with your landlord don't work out, try these solutions in order.

1. Ventilation and Air Circulation to Eliminate Odors

Your first step should be thorough ventilation. Open all windows and doors and let the apartment air out for several hours to a full day. If you have a 24-hour ventilation system, run it.

• •Depending on the season and weather, you may need to ventilate for 2–3 days continuously
• •Use a circulation fan or standing fan to create air flow
• •Skip ventilation on cloudy or rainy days when moisture enters

2. Air Conditioning Cleaning

Cigarette smoke and pet odors accumulate in air conditioner filters and interiors. Right after moving in, clean the AC filter and, if odors are strong, use a commercial AC cleaning spray or hire a professional (¥8,000–¥15,000).

DIY cleaning steps:

1. Remove the filter and use a vacuum to clear dust
2. Rinse with water and dry completely
3. Spray AC cleaning spray on the air outlets and filter mounting areas
4. Run the air conditioner on cooling and heating modes for 30+ minutes to dry the interior

Note: Professional high-pressure cleaning uses large amounts of water and can damage rental air conditioners. Consult your property manager before hiring someone.

3. Wallpaper and Ceiling Odor Treatment

For cigarette tar odors embedded in wallpaper, the following methods work:

Baking soda spray: Dissolve 1 tablespoon of baking soda in 500ml of water, pour into a spray bottle, spray directly on wallpaper, and wipe with a cloth. In rentals, test in an inconspicuous spot first to avoid damaging the wallpaper.

Commercial odor eliminator spray: Use room-wide odor sprays. Brands like Febreze or Airia that work on fabrics and air are particularly effective.

Activated charcoal: Place high-absorbency charcoal or bamboo charcoal in the corners of your room. Results take time, but they continuously absorb odors.

Avoid these wall-damaging methods:

• •Applying alcohol-based cleaners directly (risk of discoloration)
• •Using strong bleach
• •Scrubbing wallpaper vigorously

4. Flooring, Wood, and Tatami Odor Treatment

Flooring and tatami mats that have absorbed pet urine tend to hold odors particularly well.

For wooden flooring:

• •Apply a diluted pet enzyme odor eliminator (which breaks down urine and feces compounds) and let dry
• •If odors have seeped into wood gaps, consult your property manager—DIY removal has limits

For tatami:

• •Tatami absorbs odors easily, and DIY removal has limitations
• •Sprinkle baking soda across the tatami, wait 1–2 hours, then vacuum it up
• •If odors are deep-set, request that your landlord replace the tatami surface

5. Closet and Wardrobe Odor Treatment

For mold and moisture smells in storage spaces, combine these approaches:

• •Place dehumidifiers and desiccant packs
• •Use a fan to circulate air inside for several days
• •Place baking soda or charcoal in containers throughout the space
• •Install commercial closet odor eliminators (unscented types recommended)

6. Ozone Odor Treatment

For strong cigarette or pet odors, renting an ozone generator (roughly ¥3,000–¥10,000 per day) is very effective. Ozone breaks down odor molecules at the molecular level, so it's more thorough than sprays.

Important points:

• •No people or pets can be in the room during ozone treatment
• •Ventilate for 30 minutes to 1 hour after treatment before re-entering
• •Move leather items, rubber goods, and plants (they can be damaged by ozone)

Documenting Your Move-In Condition to Prevent Move-Out Disputes

If you handle previous tenant odors at your own expense, it's important to keep a record—photos and receipts. Document the state of the apartment right after move-in so your landlord can't later claim you caused the odors.

What to document:

• •Photos of the room condition before and after (showing odor areas)
• •Correspondence with your landlord or property manager (email, LINE)
• •Receipts for odor elimination products you purchased

Summary

Previous tenant odors are one of the most common issues when moving into a rental apartment. Checking during your viewing and negotiating before move-in are the most effective measures. If odors appear after move-in, you can make significant improvements through ventilation, AC cleaning, and odor-elimination products. Ozone generator rental is also a powerful option. To prevent move-out disputes, always document your apartment's condition at move-in.

When moving to a rental property, many procedures are needed from filing a moving-out notice to updating your driver's license and bank accounts. If you get the order of procedures wrong, the workload multiplies. This article explains all address change procedures before and after moving in an easy-to-understand way.