Proven Methods: How to Get Mildew Out of RV (2026)

Immediate Action (First 5 Minutes)

Stop. Open the doors. Grab your mask. If you just walked into your camper and caught that unmistakable musty, earthy odor, you have a mildew problem. I learned this the hard way after leaving my 2018 Airstream closed up for three weeks in Florida, returning to find the bathroom ceiling covered in fuzzy black spots that made my eyes water instantly. You need to act fast because mold spores multiply rapidly in the humid, enclosed environment of a travel trailer, spreading from the bathroom to the main living area in a matter of days.

Your first five minutes are strictly about containment and safety. Don't start scrubbing right away. Put on a 3M N95 respirator (Model 8210) to avoid inhaling airborne spores. Open every single window, roof vent, and door to create a cross-breeze. Turn on the exhaust fans. If you have a portable fan, point it directly out the door to push the spore-filled air outside. This isn't the time to worry about the AC running; getting fresh air moving is your top priority to stop the spores from settling deeper into your upholstery.

What You'll Need (Tools and Products)

I've tested dozens of cleaners on my own rigs over the last ten years. This isn't the cheapest option, but buying the right chemicals saves hours of frustrating scrubbing. Below is my exact toolkit for tackling both interior fabrics and exterior fiberglass.

Product / Tool	Best Used For	Price Range
RMR-86 Instant Mold Stain Remover	Hard surfaces, fiberglass, awnings	$15 - $20
Concrobium Mold Control	Interior fabrics, carpets, wood	$12 - $15
Camco 43633 Wash Brush	Exterior siding and roofs	$25 - $30
Vremi 22-Pint Dehumidifier	Drying interior spaces fast	$130 - $150

You'll also need heavy-duty nitrile gloves, a stack of microfiber cloths, and a wet/dry shop vac. I highly recommend the Ridgid 4-gallon portable shop vac because it's small enough to maneuver inside a tight camper hallway. For exterior work, grab a pump sprayer to apply your cleaning solutions evenly without wasting product.

Step-by-Step Removal

Getting rid of mildew requires a systematic approach. If you just wipe the surface, the roots remain embedded in the porous materials. Follow these exact steps to kill the fungus completely.

Step 1: Dry Vacuum and Brush

Before applying any liquid, remove the loose surface spores. Take your shop vac with a brush attachment and vacuum the affected fabric areas thoroughly. For hard surfaces, use a dry microfiber cloth to wipe away the top layer of fuzz. I'll be honest, this takes elbow grease and my shoulders always ache the next day, but skipping this step just turns the dry spores into a muddy, smeared mess when you add water.

Step 2: Apply the Right Cleaner

Match your chemical to the surface. For interior fabrics, carpets, and wood cabinets, spray Concrobium Mold Control until the surface is damp. It contains no bleach, so it won't discolor your expensive RV upholstery. For exterior fiberglass, rubber roofs, and vinyl awnings, spray RMR-86 directly onto the black streaks and spots. Keep the ambient temperature between 68°F and 75°F for the best chemical reaction. If it's colder than 50°F, the cleaner won't activate properly.

Step 3: Let it Dwell

Patience is your best friend here. Let the Concrobium sit on interior fabrics for 15 to 20 minutes. Allow the RMR-86 to sit on exterior hard surfaces for exactly 10 minutes. Don't let the RMR-86 dry completely on your awning fabric, as the sodium hypochlorite can weaken the acrylic fibers if left too long. Watch the black stains literally fade away before your eyes. It's incredibly satisfying.

Step 4: Agitate and Extract

Once the dwell time is up, agitate the area. Use a soft-bristled detailing brush for interior cushions to work the dead mold out of the fabric weave. For the exterior, use your Camco wash brush on a telescoping pole to scrub the siding. After scrubbing, use your wet/dry vac to extract the dirty liquid from the carpets and cushions. Extracting the moisture is critical; leaving it behind just feeds new mold growth.

Step 5: Rinse and Dry Completely

Rinse exterior surfaces thoroughly with a garden hose, washing all the chemical residue down the side of the rig. Inside, wipe down hard surfaces with a clean, damp cloth. Now, bring in the Vremi 22-pint dehumidifier. Run it on the highest setting for at least 24 hours. If you have kids who track mud everywhere and leave wet towels in the bathroom, you must ensure the humidity level drops below 45% before closing the doors again.

Alternative Methods

Sometimes you don't have commercial chemicals on hand, or you're dealing with delicate materials that can't handle harsh bleach-based sprays. Here are three backup methods I keep in my arsenal.

Method 1: White Vinegar and Baking Soda Paste

This is my go-to for light surface mildew on interior vinyl wallpaper. Mix equal parts distilled white vinegar and water in a spray bottle. Spray the wall generously and let it sit for 10 minutes. Next, make a thick paste using baking soda and a few drops of water. Apply the paste to stubborn spots and scrub gently with a sponge. The mild abrasion lifts the stain without scratching the vinyl coating.

Method 2: 3% Hydrogen Peroxide for Canvas

If you store your rig under a tree during the rainy Pacific Northwest spring, your slide-out toppers and canvas tents will get green mildew. Bleach destroys canvas waterproofing. Instead, pour standard 3% hydrogen peroxide into a spray bottle. Saturate the canvas and let it bubble for 15 minutes. Scrub with a soft brush and rinse with cold water. It kills the mold roots without degrading the fabric's UV protectants.

Method 3: Tea Tree Oil Spray

Tea tree oil is a powerful natural fungicide. Mix two teaspoons of pure tea tree oil with two cups of warm water in a spray bottle. Shake it vigorously before every spray. Mist this over your interior wood cabinets and let it air dry. It leaves a strong, medicinal scent for about two days, but it creates an invisible barrier that prevents spores from taking root again.

Prevention Tips

Killing the mold is only half the battle. If you don't fix the underlying moisture issue, the black spots will return within a month. After hosting a weekend camping trip with wet gear left inside, I always run through this prevention checklist.

• Install Roof Vent Covers: I swapped my standard lids for Camco Ultra Breeze vent covers. They allow you to leave the roof vents cracked open even when it's raining, providing constant airflow without letting water inside.
• Use Moisture Absorbers: Hang DampRid moisture absorber bags in the closet, bathroom, and under the bed. They cost about $5 each and pull liters of water out of the air during long-term storage.
• Wax the Exterior: Mildew struggles to stick to slick surfaces. I apply Meguiar's Gold Class Premium Liquid Wax to my fiberglass exterior twice a year. It creates a hydrophobic barrier that sheds rain and prevents black streaks from forming.
• Inspect Silicone Caulking: Check the sealant around your windows and roof seams every six months. If the caulk is peeling, water seeps behind the walls, creating a hidden breeding ground for toxic black mold that you won't see until the wall turns to mush.

FAQ

Can I use bleach on RV canvas?

Never use straight bleach on acrylic canvas because it destroys the water-repellent coating and rots the stitching. I recommend using a dedicated canvas cleaner like 303 Products Mold & Mildew Cleaner instead. If you absolutely must use bleach for severe black mold, dilute it to a 10% solution and rinse it off within five minutes.

How do I get mildew smell out of RV cushions?

Remove the cushion covers and wash them in hot water with a cup of white vinegar to kill the odor-causing bacteria. For the foam inserts, sprinkle a generous layer of baking soda over the surface and let it sit for 24 hours before vacuuming it up with a shop vac. If the smell lingers, place the cushions outside in direct sunlight for a full afternoon, as UV rays naturally neutralize mildew odors.

Is RV mildew dangerous to my health?

Yes, breathing in mildew spores in a confined space like a travel trailer can trigger asthma attacks, allergic reactions, and chronic respiratory issues. I always wear a properly fitted 3M N95 respirator when cleaning out a heavily infected rig to protect my lungs. If you experience persistent coughing or headaches after sleeping in your RV, you likely have a hidden mold problem behind the walls.

Will vinegar kill black mold on RV rubber seals?

White vinegar kills about 82% of mold species, making it a decent choice for light surface mildew on your slide-out seals. However, it won't penetrate deep into the porous rubber to kill the roots of severe black mold infestations. For deep stains on EPDM rubber seals, a specialized product like Valvoline's Mold & Mildew Remover works much better without drying out the rubber.