I have a new foam mattress and it smells. Apparently it needs to be aired out for several days. Is there anything I can do to speed up this process? I'm thinking temperature, humidity, fans, baking soda?
6 Answers
Coming from a place on earth where we can't leave stuff outside all the day due to the weather conditions, I would leave the mattress standing on the long side edge in a ventilated room.
This would maximize the surface area exposed to the air, which would help vent away the new mattress smell slightly faster.

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1The smell did not clear after 2 weeks. I complained to the retailer. They replaced it. I aired out the replacement like you said, on one side. That one worked after a few days :) – Liam Dec 14 '17 at 19:38
All you must do is follow these simple steps:
- Open the mattress
- Put the mattress on its side
- Open all the windows and doors which are in the room of the mattress
- Try to create a cross-breeze (this is by opening the doors of multiple rooms and allowing the air to enter through one window in one room, and leave from another window in another room
- After 24 hours your mattress should smell of nothingness!

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I was frequently dealing with smelly cloths, after going to a pub( where there was always a lot of smoke) then friend told me to put the things overnight on a radiator(heater with circulating hot water). It helped a lot.
The hot air makes the circulation, the heat will help the smelly particles dissipate.
I would suggwst putting it into the sun somewhere for a day or more. It should do the trick.

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As you said, using baking soda will help, but I´ll suggest to use it with essential oil in addition.
So, if you still have the (plastic) bag the mattress was packaged in, put it back in the bag and insert a small box with baking soda, and add a few drops of essential oil (lavender or another aroma you like). If possible, put tape on the bag (to disallow air flow) and leave it like this about 6-8 hours.
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I'm sorry, but this is incorrect. The odor of a new foam mattress is from the synthetic polyurethane resins that build up in small quantities in the air-tight packaging the mattress is shipped in. This is very similar to the material used in paint and adhesives, but you wouldn't recommend closing up a newly painted surface with baking soda and an Airwick to get rid of the smell. You need to let those compounds off gas — not close them in with essential oils — in order to get rid of them safely. – Robert Cartaino Apr 15 '17 at 17:51
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I know what I am talking about cause I do this two times with new pillows.The idea is to mask smell for few days, exactly enough to smell retire from mattress naturally. Keeping mattress with essential oil in bag didn´t get smell worse. And you can´t compare painted room and foam mattress (and using baking soda to get rid of smell in room :) ), even materials are similar. – se0D2 Apr 15 '17 at 18:40
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3Masking the smell might be ok in some cases, but in my case the gases affect my sinus, and essential oils would likely make this worse. – Liam Apr 15 '17 at 22:16
My mother always kept newly bought mattresses in the sun from morning to evening in an aerated region, and then repeated this for a week.
This probably reduce the smell of the matress.

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Simples. Spray this on the mattress:
Now it will smell like new car smell, not new mattress smell.