Your moldy shower curtain is gross—and for indoor allergy sufferers, it's downright toxic. Millions of Americans suffer from indoor allergies. Mold, which releases spores, is one of the biggest culprits. But you can put up a good fight against this household invader! Start by making a homemade mildew mist. Combine two teaspoons of tea tree oil with two cups of water in a spray bottle. Spray on problem areas without rinsing and watch the mold-killing magic begin. Because fungi thrive on soap film that coats tiles, make a point to scrub sinks and tubs at least monthly. Of course, it's best to prevent mold, and that can be done by keeping your household humidity below 45 percent. To measure humidity levels, invest in an instrument known as a hygrometer. With these simple tips, you CAN win the war on mildew—and have your shower to yourself again!