Tested: How to Get Mildew Out of Toaster Safely (2026)

Immediate Action (first 5 minutes)

Unplug it immediately. Don't just turn off the switch or flip the lever. You need to completely sever the power source before you start poking around inside a damp appliance. When I left my Cuisinart 4-slice in the cabin over a particularly humid July, I returned to find a faint, musty smell that told me exactly what had been growing on the crumb tray.

Grab a trash bag. Take the toaster outside or to a very well-ventilated area like a garage with the door open. Mildew spores are microscopic and will fly everywhere when you start shaking the unit. You don't want those spores settling onto your kitchen counters or getting inhaled by your kids.

Shake it out vigorously. Turn the toaster completely upside down over the trash bag and give it a few hard shakes. This dislodges the bulk of the stale, moldy crumbs that are acting as a food source for the fungus. If your toaster has a removable crumb tray, slide it out and dump it directly into the garbage. Do not rinse it in the sink yet.

What You'll Need (tools/products)

Gathering the right supplies makes this job infinitely easier. I've tested dozens of cleaning agents on small kitchen appliances over the years, and harsh chemicals are a terrible idea near heating elements. Here is my exact toolkit for safely eradicating fungal growth without frying the internal wiring.

Item	Estimated Cost	Purpose
Heinz White Vinegar (5% acidity)	$3 - $5	Kills 82% of mold species safely
OXO Good Grips Appliance Brush	$8 - $10	Scrubs crumb trays without scratching
Q-tips Cotton Swabs (100-pack)	$4 - $6	Precise cleaning around fragile wires
Arm & Hammer Baking Soda	$2 - $4	Absorbs lingering musty odors
Microfiber Cloths (12-pack)	$12 - $15	Lint-free wiping for exterior surfaces

I highly recommend using standard 5% acidity white vinegar rather than cleaning vinegar. Cleaning vinegar is stronger, but it can corrode the thin metal shielding on older toaster elements. Stick to the food-grade stuff. It's safer and smells less aggressive.

Step-by-Step Removal (4-7 steps)

This isn't the fastest process, but rushing it will fry your appliance. I'll be honest, cleaning the actual heating wires is a pain. You have to be incredibly gentle to avoid snapping the fragile mica sheets or bending the nichrome wires. Follow this exact routine to get how to get mildew out of toaster slots effectively.

Step 1: The Dry Brush Out

Take your soft-bristled brush and gently sweep the inside of the toaster slots. Work from the top down, coaxing any stubborn, moldy crumbs loose. Keep the unit tilted at a 45-degree angle so gravity helps the debris fall out. Never use a metal fork or knife to scrape the inside. You will permanently damage the heating elements and create a massive shock hazard.

Step 2: The Vinegar Wipe Down

Mix equal parts distilled water and white vinegar in a small bowl. Dip a microfiber cloth into the solution and wring it out until it is barely damp. Wipe down the exterior casing, the lever, and the dial. If you have a stainless steel model like the Breville BTA820XL, wipe in the direction of the grain to avoid streaking. Dry it immediately with a separate, clean cloth.

Step 3: Treating the Crumb Tray

Remove the crumb tray and take it to the sink. Spray it generously with straight white vinegar and let it sit for exactly 10 minutes. This dwell time is critical for breaking down the mildew roots. Scrub the tray with your OXO brush, rinse it with warm water, and dry it completely with a towel. Do not put it back into the toaster until it is 100% bone dry.

Step 4: Swabbing the Heating Elements

This is the most delicate part of the job. Dip a cotton swab into the vinegar solution and squeeze out the excess liquid. Gently dab the swab against any visible mildew spots on the internal wire racks. You want the swab to be moist, not dripping. If liquid drips down into the bottom mechanism, it can short out the solenoid that holds the lever down.

Step 5: Baking Soda Deodorizing

Mildew leaves behind a stubborn, earthy odor that vinegar alone won't fix. Sprinkle a generous layer of dry baking soda directly into the toaster slots and onto the bottom tray. Leave it sitting there for 24 hours in a dry room. The baking soda will absorb the trapped moisture and neutralize the volatile organic compounds causing the smell. Dump the powder out the next day.

Step 6: The High-Heat Burn-Off

Reassemble the toaster and plug it in near an open window or under your stove's exhaust hood. Turn the browning dial to the maximum setting and push the lever down without any bread inside. Let it run a full cycle at roughly 400°F for 10 minutes. This burns off any residual vinegar smell and kills remaining microscopic spores. Expect a little bit of smoke; that is completely normal.

Alternative Methods (2-3 backup methods)

Sometimes vinegar just doesn't cut it, especially if the appliance was stored in a flooded basement or an un-winterized RV. If the fungal growth is severe, I rely on these backup strategies to salvage the machine.

Method 1: 70% Isopropyl Alcohol

Alcohol evaporates much faster than water, making it significantly safer for electrical components. Dampen a cloth with 70% isopropyl rubbing alcohol and wipe down the interior slots. The alcohol destroys the mildew cell walls on contact and dries in about 3 minutes. I use this method exclusively on vintage toasters where the internal wiring insulation might be brittle and prone to water damage.

Method 2: UV-C Light Treatment

If you refuse to put any liquids inside your appliance, ultraviolet light is your best friend. Place the toaster outside in direct, blazing sunlight for 6 hours with the slots facing the sun. Alternatively, use a handheld UV-C wand (like the HoMedics UV-C sanitizer, around $35) and slowly pass it over the internal wires. UV light scrambles the DNA of the mold spores, rendering them completely inert without touching a single wire.

Prevention Tips

Stopping mildew before it starts saves you a massive headache. Fungal spores need three things to grow: organic matter, moisture, and warmth. Your toaster provides the organic matter in the form of burnt toast crumbs, so you have to eliminate the moisture.

Empty the crumb tray every single week. If you have kids who drop jam-covered bread or buttery waffles into the slots, clean it twice a week. Sugary, damp crumbs are basically a luxury resort for mold. I keep a small dustpan brush right next to my coffee maker to remind myself to sweep the tray every Sunday morning.

Store it properly during long absences. If you are closing up a summer cabin or winterizing an RV, put the toaster inside a large plastic trash bag. Toss in three or four silica gel desiccant packets to absorb ambient humidity. Tie the bag tightly. When I forgot to do this at my lake house, I had to throw away a perfectly good $80 KitchenAid toaster because the mildew had eaten into the plastic housing.

FAQ (3-5 questions)

Can I use bleach on my toaster to kill mildew?

You should never use bleach inside a toaster because the chemical residue will release toxic fumes when the heating elements get hot. I tried a diluted bleach solution on an old Black+Decker model years ago, and the smell was absolutely unbearable and unsafe. Stick to white vinegar or rubbing alcohol for a much safer, food-grade clean.

Is it safe to eat toast made in a mildly mildewed toaster?

Eating food from a contaminated appliance is a bad idea since mildew spores can easily transfer to your bread and cause respiratory or digestive issues. Even if you scrape off the visible fuzz, microscopic spores remain embedded in the crumb tray and wire racks. Always perform a full cleaning and a high-heat burn-off cycle before making your next breakfast.

How do I clean the inside without ruining the delicate wires?

The secret is avoiding excess moisture by relying on dry brushing and barely damp cotton swabs instead of spraying liquids directly into the slots. I always turn the toaster completely upside down over a trash can to let gravity do the heavy lifting for loose debris. If a wire looks particularly grimy, use a dry, soft-bristled toothbrush to gently dislodge the gunk without bending the fragile metal.