D.B.
Hi Emma,
Ok, this is going to sound crazy, but I'm a frugal hack nut. Which means I am always looking for cheaper and better ways to do things. Recently, I came across a DIY recipe for stain remover from a Mom with 3 boys. I tried it, and I'm completely impressed! I was even able to remove a dryer set make-up foundation stain from my favorite purple shirt! It's safe for colors and whites and is super cheap.
1/3c Dawn dish soap (must be Dawn!)
1/3c household ammonia (at Walmart or Target in the laundry aisle)
3 tablespoons baking soda
1c water
Put all the ingredients together adding the Dawn last. Stir/shake to combine. Either spray on with a bottle, or just pour some onto your mildew/stains. Wash with your regular laundry soap and water temperatures. Hope this helps!