Drape the clothing over a drying rack that's been set up in a sunny area. Leave the clothing with the purple mildew stains to dry, exposed to sunlight.
Brush the dead mildew spores off the surface of your clothing with a soft bristled brush.
Pour 8 ounces of water into a squeeze top bottle, similar to the reusable plastic ketchup bottles. Add 1 ounce each of glycerin and dishwashing detergent. Close the bottle and shake it to mix the three ingredients.
Lay the purple mildew stained clothing on a flat work surface. Squirt the homemade dishwashing detergent stain remover onto the stains until covered. Allow the detergent-based stain remover to soak into the fabric for two to three minutes.
Sponge the mildew stains with a damp cloth to remove stains.
Wash your clothing in the hottest water possible, using laundry detergent. Add 1 cup of white vinegar to the rinse cycle to remove any lingering musty smell from the mildew.
Air dry your clothing on the drying rack.