Wash silicone food bags in hot water with washing-up liquid straight after use, then soak them in a bicarbonate of soda solution for 20-30 minutes if the smell lingers. Skip that soak and odour molecules from garlic, curry or fish stay trapped in the bag's seams and micro-texture, resurfacing every time you reuse it, even after a normal wash.
- Cleaning silicone food bags to prevent odour means a hot soapy wash immediately after use, not hours later.
- A bicarbonate of soda soak for 20-30 minutes lifts garlic, onion and curry smells that washing-up liquid alone misses.
- Drying the bag fully inside out before sealing it stops trapped moisture turning into a mildew smell.
- Reusable silicone food bags hold up to repeated washing far better than disposable plastic bags, which is why they're worth the extra 60 seconds of care.
Why this matters
More households are swapping single-use plastic bags for reusable silicone ones in 2026, and the switch only works long-term if the bags stay fresh. A reusable silicone food storage bag that smells of last week's curry defeats the point of buying it, and it's usually the reason people quietly go back to cling film.
The good news: odour build-up in silicone bags is almost always a drying problem, not a material problem. Get the drying step right and most smell complaints disappear.
How to clean silicone food bags to prevent odour
Follow this order every time, and don't skip step 5 even when you're in a hurry.
- Rinse immediately after emptying the bag, before any residue dries onto the surface.
- Wash inside and out with warm water and washing-up liquid, working a soft brush or scourer into the seams and corners where food gets trapped. A coconut kitchen scourer reaches into folds better than a flat sponge.
- Soak in bicarbonate of soda (roughly a tablespoon dissolved in warm water) for 20-30 minutes if you've stored anything strong-smelling — garlic, onion, curry, fish, or fermented foods.
- Rinse thoroughly until no soap residue remains. Leftover soap film traps smell just as effectively as leftover food does.
- Turn the bag inside out and air dry fully, propped open so air reaches every surface. A bag dryer stand or an upturned glass works if you don't own a dedicated rack.
- Store dry and unsealed, or loosely closed, until you use it again. Sealing a damp bag is the single biggest cause of musty odour in reusable silicone.
Why silicone food bags hold onto odour
Silicone is non-porous at a molecular level, but real-world use introduces the conditions that trap smell anyway. These are the causes worth ruling out one by one:
- Sealing while still damp — trapped moisture with no airflow is the number one cause of a musty, mildew-type smell.
- Strong-smelling foods without a soak step — garlic, onion, curry and fish leave oils that a quick rinse doesn't fully lift.
- Soap residue left in seams — under-rinsing leaves a film that smells stale within a day or two.
- Scratched or worn surfaces — older bags with visible scuffing hold onto oils more stubbornly than a smooth new one.
- Reusing without a full wash between very different foods — going from raw meat storage straight to fruit without a proper clean carries smell across.
- Storing folded or sealed shut — no airflow means any residual moisture has nowhere to go.
Garlic and onion smell
Soak the bag in a bicarbonate of soda solution for 20-30 minutes, then rinse and add a squeeze of lemon juice to the final rinse water. Garlic and onion oils cling to silicone more than most foods, so this is the one combination worth doing every single time rather than only when the smell is already noticeable.
Turmeric and curry stains
Curry smell and yellow staining usually arrive together. A bicarbonate of soda paste left on the stained area for 15-20 minutes before washing lifts most of the colour, and drying the bag in direct sunlight afterwards fades what's left — sunlight breaks down the pigment that causes turmeric staining.
Fish and meat smell
A vinegar rinse (equal parts white vinegar and water) after the normal wash neutralises fish and raw meat odours that soap alone won't shift. Rinse the vinegar out fully afterwards so the bag doesn't pick up a vinegar smell of its own.
Can you put silicone food bags in the dishwasher?
Most reusable silicone food bags are dishwasher safe, but hand washing gives you more control over the odour-removal steps above, particularly the bicarbonate of soda soak. If you do use a dishwasher, still rinse the bag first and dry it fully inside out afterwards rather than leaving it sealed in the cutlery basket.
How do you get curry stains out of a silicone bag?
A bicarbonate of soda paste left on curry stains for 15-20 minutes followed by a wash and a sunlight-dry removes most turmeric staining from silicone. Repeat the sunlight step over a couple of days for stubborn, older stains rather than scrubbing harder, which can dull the surface.
How often should you deep clean reusable silicone bags?
A full bicarbonate of soda soak once a week is enough for bags used daily for lunches or snacks, more often if you've stored something particularly pungent like fish or curry. Bags used only occasionally just need the standard wash-and-dry routine after each use.
FAQ
What's the best way to clean silicone food bags?
Wash with warm water and washing-up liquid straight after use, then soak in a bicarbonate of soda solution for 20-30 minutes if any smell remains. Drying the bag fully inside out before storing prevents the smell coming back.
Is vinegar or bicarbonate of soda better for odour in silicone bags?
Bicarbonate of soda handles garlic, onion and curry smells best, while vinegar works better on fish and raw meat odours. Both need a thorough rinse afterwards so the bag doesn't pick up a smell of its own.
How long should you soak silicone bags to remove smell?
Soak for 20-30 minutes in a bicarbonate of soda solution for most cooking smells. Stubborn odours from fish or fermented foods may need a second soak the next day.
Can you use bleach on silicone food bags?
Bleach isn't necessary for odour removal and can leave its own smell behind if not rinsed completely. Bicarbonate of soda and vinegar handle the same job without that risk.
Do silicone bags smell after washing?
Yes, if they're sealed while still damp — trapped moisture causes a musty smell within a day or two even after a proper wash. Full air-drying inside out before storing is the fix.
How do you dry silicone bags properly?
Turn the bag inside out and prop it open so air reaches every surface, rather than laying it flat sealed shut. A dish rack or upturned glass works as a makeshift dryer stand.
Are reusable silicone bags better than plastic zip bags for odour?
Reusable silicone bags hold up to repeated washing and odour-removal soaks far better than single-use plastic bags, which tend to absorb smell permanently after one or two uses with strong foods.
Can silicone bags go in the freezer without smelling?
Yes, as long as the bag was washed and dried fully before freezing — freezing doesn't remove existing odour, it just locks it in until the bag thaws.
One last thing
Most lingering smell isn't the silicone itself failing — it's oil sitting in a scratch or worn patch on the surface. Run a finger over the inside of the bag: if it feels slightly sticky or rough rather than smooth, that's where odour is hiding and no amount of soaking will fully shift it. At that point, replacing the bag does more for the smell problem in 2026 than another round of bicarbonate of soda.
