 A mixture of bleach diluted with 10 parts water will kill the growth. Outside on vinyl or aluminum siding, be sure to choose bleach formulated for outdoor use. But for porous surfaces, bleach isn't as effective. Instead, look for an antimicrobial spray that will not only kill the existing mold and mildew, but will also inhibit its future growth. I'm Danny Lipford with tips for today's homeowner.