Try using white vinegar. It is great for mold/mildew removal and for preventing in the future. For heavy mildew, use full strength vinegar, or mix 1 part vinegar with 3 parts vinegar for light mildew. The smell of vinegar will be strong at first but will dry quickly.
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It will also help to deodorize the tent as well. As for using vinegar when camping, add a few drops of vinegar to your drinking canteen or thermos. It will keep the water fresh longer and be a better thirst quencher. You will not taste the vinegar.