A common question that we are frequently
asked is "why can't I just throw some bleach on the mold?" While
bleach is a great product when used as it is intended, it has never
been intended for mold cleanup, especially on porous surfaces.
Bleach manufacturers' labels state the products is effective on
"hard, nonporous surfaces". While bleach is effective on tubs, tile,
countertops, sinks, toilets, etc, it is not a good choice for use on
wood, drywall, carpet, trim, floor joists, attic sheeting, etc. So
why is bleach not recommended for porous surface?
Bleach is unable to cut through dirt. Prior to sanitizing a surface, it must be cleaned. Dirt and mold growth must be physically removed prior to applying an appropriate sanitizer. [In a 2004 study of five different household products to try to clean a moldy shower curtain, The Wall Street Journal reported that the least effective product was chlorine bleach.]
Bleach damages floor finishes: Bleach attacks floor coatings, eating away at their appearances.
Bleach damages fibers, carpets etc. Moldy carpets and fabrics should be discarded as part of mold remediation.
Bleach corrodes hard surfaces: Metals and other surfaces can not only be corroded, but discolored.
Bleach can hide dirt: Bleach can make some soil transparent and dirt left behind can still foster mold growth.
Bleach loses strength rapidly: Chlorine begins to break down quite quickly and consistently after bleach is manufactured.
Chlorine Bleach is NOT a registered EPA mold remediation product. You can verify it yourself when you are unable to find an EPA registration number for mold application on the label of any brand of chlorine bleach.
Use of Bleach on porous surfaces can accelerate mold growth. Bleach cannot penetrate into mold's tiny hyphae
(roots), but the water part of the bleach formula will. This may
allow new growth to occur with the introduction of new moisture.
Using bleach on these surfaces can actually spread mold growth.