We bought a new bed and new mattress and new mattress topper (all from Ikea)about 7 months ago.
There was quite a strong and not particularly pleasant 'new' smell, but it even said on the label that there might be a 'new' smell but that it would wear off.
It hasn't worn off.
We have a mattress protector and I regularly change the sheets, but still when you sink into bed at the end of the day it doesn't smell delicious. It smells bad. It's a very specific smell and for a minute you think it could be a farty, feety smell but it isn't.
It is the most comfortable bed and mattress I have ever had. I love it so much. Please tell me how to make it smell delicious and fresh.