Here are the best ways to remove odors from carpet.

1. Air out the room(s) – Open windows and turn on ceiling fans.
2. Vacuum the carpet (making sure that the vacuum cleaner is on the correct setting for your carpet). Many odors in the carpet are just on the surface, and giving the carpet a thorough vacuuming can improve the smell, especially if you have pets and kids. Hair and pet dander can actually create odors as well. It's important to cross vacuum (vacuuming in one direction then vacuuming in another direction).
3. Then apply baking soda to the carpet. Baking soda is known for its odor-eating properties. Make sure to concentrate on those areas which you know to be especially smelly; for these special spots, liberally apply the baking soda and lightly brush in.
4. Let the baking powder sit for 2 days or so, then vacuum the baking soda up. It is very important to take your time and thoroughly vacuum up all the baking soda.

If the above instructions don't get rid of the odor, try this:

1. Apply vinegar to the spot on the carpet. Allow the vinegar to sit for about 30 minutes to give the acid in the vinegar a chance to neutralize the odor.
2. When done, blot up the vinegar and use water to absorb the rest of the vinegar out of the carpet.

If that still doesn't work, use hydrogen peroxide, the same way that you used the vinegar.

It is important to always take your time and pre-test all fabric with these products to ensure it will be safe for the carpet colorfastness. And never use these products on any natural fibers such as wool, silk, and cotton.