Here's a great post on getting rid of basement smells.
Do you know what the smell is coming from?
Hello Jurni. Charcoal works good on eliminating bad smells. But it takes time. Place the charcoal on a plate and put it in your basement. It may take a week or more to be effective.
Use Vinigar and put some amonia in it with some water and dawn soap and clean it nicely. It will go away instantly. Hope it helps!
Clean up anything that is causing odors such as a pet waste. A dehumidifier helps if it's caused by dampness. We had something die in our attic a few years ago and couldn't find it. I bought a product called Odor Sponge and that took care of the smell.