Even if you use scented detergent and fabric softener, this can happen and you may not know what to do. You should know that the detergent drawer and fabric softener residue are usually the cause of your washing machine odor. That is why you must clean it thoroughly and disinfect it.
Here's what to do:
Remove the entire drawer with both cases. Then fill a basin with hot water and add half a liter of vinegar (the cheapest, it does not matter). Then immerse the drawer in the basin and let it soak. Then use a small brush to reach the most difficult places, which are not easy to reach with your fingers and a cloth or sponge.
The very difficult points can be cleaned with a cotton swab. Wipe with a paper towel and allow the moisture to dry well before putting it back in place.
From the next wash you will see a difference in the smell of your clothes.