Similar to pet odors, knowing if your mattress could smell is easy: Do you have a human body with skin and oils? Do you sleep on it?
Eventually, all the dead skin and body oils you shed while sleeping are going to build up, and stink they will, especially if your bedding is older.
You can’t exactly toss your mattress in the washing machine, so you’ll have to deal with it where it lies.
But it’s an easy fix: Sprinkle baking soda on it, let it sit for an hour or more, and then vacuum up the soda. (This works for memory foam, too.) Add a couple drops of essential oil to the soda (drip directly into the box and shake it well to mix evenly) for a pleasant smell. Bonus: Lavender has been shown to help you sleep.
Call me now to get your good-smelling home sold fast.