The cleaning methods we listed previously like the vinegar, lemon, and tea tree oil are great for eliminating that odor. However, you can also find similar results using the combination of baking soda, vinegar, and water, or a cup of bleach with a cup of warm water will work. If you like the idea of more natural methods like tea tree oil, there are plenty of options in various essential oils that are all efficient at eliminating the smell. You could also use hydrogen peroxide, or borax to scrub into the tent with water.