When your pillow cases still smell like body odor even after they go through the wash, there are some things that you can do to solve the problem. One solution is to rinse the pillow cases a second time with clean fresh water. The detergent you used to clean them may have left some residue on the cloth and therefore they may still contain the bacteria which was supposed to be removed. Another way is to put them under the sun for a couple of hours. The sun’s rays and heat are a very good disinfectant and the bacteria thriving on the fabric of the pillow cases will surely die after having been under the sun for quite some time. However, make sure to thoroughly wash the pillow cases first.