We use alot of towels here. We got to the point of only being able to use them only a couple of times before they would smell really mildewy. It bugged the heck out of me and I would wash them in hot water and dry them at the hottest settings. It didn’t help. I looked up ‘getting mildew out of towels’ and I found this and it works!
Another neat thing that I found was dry cleaning sheet. I was skeptical about them but they work in a pinch. I wouldn’t use them on big stains but they’re very useful for freshening up clothes.