Tested & Easy: How to Get Mildew Out of Loofah Fast

By Marcus Chen · January 15, 2026

Immediate Action (first 5 minutes)

I'll be honest, finding black or pink spots on your shower pouf is incredibly gross. Grab your loofah. Take it out of the humid shower environment immediately to stop the ambient moisture from feeding those stubborn fungal spores. You need to act fast.

If you have kids who track mud everywhere and leave their bath sponges in a puddle, you've probably seen this pink slime. It's actually a bacteria called Serratia marcescens, but we treat it just like mildew. Run the sponge under the hottest tap water you can stand for exactly 60 seconds. This initial 120°F rinse won't kill the roots, but it washes away loose surface debris and soap scum. Squeeze it out completely. Don't just wring it lightly. Press it flat against the sink basin to force every last drop of water out of the synthetic mesh.

What You'll Need (tools/products)

I've tested dozens of cleaning combinations over the last decade. You don't need fancy $25 boutique bathroom cleaners to fix this problem. Here is the exact gear I keep under my sink for this specific job.

Item	Brand/Model Recommendation	Estimated Cost
White Vinegar	Heinz Cleaning Vinegar (30% acidity)	$4 - $6
Baking Soda	Arm & Hammer Pure Baking Soda	$1 - $2
Silicone Tongs	OXO Good Grips 12-Inch Tongs	$12 - $15
Microwave	Any 1000W model (e.g., Panasonic NN-SN67K)	N/A

Make sure your vinegar is actually the cleaning variety. Standard culinary vinegar is only 5% acidity, which takes way too long to break down mildew spores. The 30% cleaning version cuts through the grime in minutes.

Step-by-Step Removal

This is my go-to routine. It takes about 20 minutes of active time, plus soaking. I recommend this because it uses heat and acidity to destroy the cell walls of the mildew without melting your plastic mesh.

Step 1: The Vinegar Soak

Fill a glass bowl with equal parts hot water and cleaning vinegar. Submerge the loofah completely. You must weigh it down with a heavy ceramic plate, otherwise the buoyant plastic mesh will just float to the top and expose the mildewed sections to air. Let it sit for exactly 15 minutes. The acetic acid penetrates the porous surface and starts dissolving the fungal structure. If the water cools down too much after 10 minutes, carefully pour out half the bowl and replace it with freshly boiled water from your kettle. Maintaining that high temperature is crucial for breaking down the biofilm that protects the mildew colonies.

Step 2: The Baking Soda Scrub

Pull the loofah out and rinse it briefly. Sprinkle two tablespoons of Arm & Hammer baking soda directly onto the damp mesh. Scrub it vigorously. I'll be honest, this takes elbow grease and your hands might get a little tired from squeezing the stiff mixture through the netting. The abrasive texture of the baking soda physically scours away the dead spores while neutralizing the lingering vinegar smell.

Step 3: The Microwave Blast

This is the secret weapon. Place the wet, soapy loofah on a microwave-safe plate. Zap it on high for 90 seconds. The trapped water inside the mesh turns to steam, reaching temperatures over 212°F to sterilize the inner layers that the vinegar couldn't reach. Never microwave a dry loofah. The synthetic plastic will melt and potentially catch fire within seconds. If you're cleaning the guest bath after hosting a dinner party and notice the spare loofah is compromised, use this microwave method for a quick 90-second fix before your guests arrive.

Step 4: The Cool Down and Dry

Grab your tongs. You must use silicone-tipped tongs like the OXO Good Grips 12-inch pair to avoid scratching your microwave turntable while retrieving the scorching hot sponge. Wait 10 minutes. Rinse it under cold water to stop the cooking process, squeeze out the excess moisture, and hang it in direct sunlight. UV rays provide a final layer of natural disinfection. I usually leave mine on the back porch railing for at least two hours. If you live in a rainy climate or an apartment without outdoor access, place it directly in front of an oscillating fan like the Vornado 630. The constant airflow mimics the drying power of the sun and prevents moisture from settling back into the core.

Alternative Methods

Sometimes the vinegar trick just doesn't cut it. If you're dealing with a loofah that's been sitting in a damp gym bag for a month, you need heavier artillery. Here are three backup strategies I use when the standard soak fails.

The Bleach Shock Treatment

This isn't the cheapest option, but it works on severe cases where black spots have deeply penetrated the plastic fibers. Mix 1/4 cup of Clorox Regular Bleach into one gallon of cold water in a plastic bucket. Drop the loofah in and let it soak for exactly 5 minutes. Any longer than 5 minutes and the bleach will start degrading the synthetic nylon, making it brittle and scratchy against your skin. Rinse it thoroughly under cold water for three full minutes before using.

The Dishwasher Sanitize Cycle

If you own a modern dishwasher with a dedicated sanitize setting, you can use it to clean your bath sponges. Place the loofah on the top rack of your Bosch 800 series dishwasher, securing it between the tines so it doesn't fly around. Run the 'Sanitize' or 'Heavy' cycle, which typically heats the water to 155°F. Don't use this method if your dishwasher has a heated dry element at the bottom, as the intense radiant heat can warp the plastic mesh into a useless lump.

The Boiling Water Bath (Natural Loofahs Only)

Natural loofahs are made from dried gourd plants and require a completely different approach. Bring a large pot of tap water to a rolling boil on your stove. Drop the natural sponge into the water and boil it for 3 minutes. The plant fibers can withstand the 212°F heat much better than plastic, and this effectively kills mold roots hidden deep inside the fibrous network. Remove it with tongs and let it air dry completely on a wire cooling rack.

Prevention Tips

Cleaning a moldy sponge is annoying. Stopping it from growing in the first place is incredibly easy. In my experience cleaning tile and shower enclosures for 10 years, the bathroom environment is a breeding ground for moisture-related issues. Follow these rules to keep your bathing tools pristine.

Ditch the showerhead hook: Hanging your loofah directly on the showerhead guarantees it stays wet. The ambient steam from your next shower will re-wet it before it ever dries. Install a dedicated suction cup hook with a 3-inch clearance from the wall to allow 360-degree air circulation.
Squeeze it every single time: Don't just drop it. Take three seconds to wring out 90% of the water before you leave the bathroom. Less moisture means less food for mildew spores.
Implement a weekly rinse: Once a week, take the loofah out to the kitchen sink. Douse it in boiling water from your electric kettle. This 10-second habit kills early-stage spores before they become visible black spots.
Respect the expiration date: Synthetic poufs need replacing every 3 to 4 weeks. Natural plant loofahs last slightly longer, usually 4 to 6 weeks. When your landlord inspects next week, a frayed, moldy loofah hanging on the faucet looks terrible and signals poor maintenance.
Keep it away from the toilet: If your bathroom is small, flush with the lid down. Airborne particles from the toilet can settle on damp sponges, introducing entirely different types of bacteria to your bathing routine.
Buy in bulk: Consider buying a multi-pack. I always buy the 6-packs from Amazon for about $12. When one gets questionable, I just toss it and grab a fresh one from the cabinet under the sink. It removes the emotional attachment to a dirty sponge and keeps your shower routine hygienic.

FAQ

Can I just wash my loofah in the washing machine?

You technically can, but I strongly advise against it. The aggressive agitation of a standard washing machine cycle will tear the delicate plastic netting apart, leaving you with a tangled mess of loose strings. If you absolutely must use a machine, place the loofah inside a mesh laundry bag designed for delicates. Run it on the gentle cycle with cold water and absolutely no fabric softener, as softeners leave a waxy coating that traps bacteria.

How do I know if it's mildew or just trapped soap scum?

Soap scum usually presents as a stiff, white, or yellowish crust that flakes off when you scratch it with your fingernail. Mildew looks different. It appears as distinct black, dark green, or fuzzy pink spots that seem to stain the actual fibers of the mesh. If it smells musty, you have a fungal bloom.

Is it safe to use a loofah that had mildew on it after cleaning?

Yes, it is perfectly safe as long as you followed the high-heat sterilization steps outlined above. The combination of acetic acid from the vinegar and the 212°F steam from the microwave completely destroys the cellular structure of the mold. However, if the plastic mesh feels brittle, stiff, or starts flaking after the cleaning process, you should throw it away and buy a new one.

Do natural loofahs get mildew faster than plastic ones?

Natural loofahs absolutely attract mildew much faster than their synthetic counterparts. Because they are made from organic plant cellulose, they actually provide a physical food source for mold and bacteria to consume. Plastic mesh offers no nutritional value to spores, meaning the mildew on synthetic sponges is only feeding on your leftover dead skin cells and soap residue.