Moisture + mold spores + time = mold infestation.
You can't block mold spores from entering your home, but you can control its growth by keeping your home dry. Inspect your home for sources of moisture: leaky roofs, plumbing, and unventilated bathrooms are common culprits. If your home has a 60% or higher level of humidity, mold can grow anywhere.

Suddenly those dust bunnies don't seem so innocent...
Water provides the atmosphere. Give mold its favorite foods and your home becomes the perfect hotspot for fungi. Dust, soil, and grease are on the menu, so keeping your home clean is the first natural step toward battling mold.

Safe Mold Removal Guidelines

To get rid of the odor and unsightliness of mold, it should be cleaned, or the material should be removed from the home. Large or hidden moldy areas require the remediation of a qualified professional. Treating a small, visible area yourself is doable, and you don't have to reach for the bleach to do it. These methods are safer:

• Sprinkle baking powder on a horizontal surface, spray a 50-50 water and white vinegar solution. Scrub and retreat as needed.

• Tea tree oil, mixed with water, (2 teaspoons to 2 cups water), will kill mold spores on hard or porous surfaces. Use ½ teaspoon in the laundry for musty-smelling washable fabrics.

• Straight vodka in a spray bottle is effective at mold removal (let it sit at least 15 minutes), and leaves no lingering scent.

• Rubbing alcohol diluted with water (1:1) can be used on leather goods. Test first on a small hidden area.

Prevention practices will help keep mold from re-blooming. Install a humidity sensor, and run a dehumidifier in problem rooms. Install a light in a shower or closet, and leave it on 24/7. Order silica gel from a science supply company to absorb moisture in areas where other methods won't work—you can reuse it multiple times by drying it in the oven.

Stop living with a creepy roommate.
Keep humidity at safe levels, chase down those dust bunnies, apply elbow grease to washable surfaces, and get rid of materials beyond hope. Consult the EPA for specific cleanup guidelines.