Mold found on hard surfaces can typically be removed with a damp cloth and a general household cleaning agent. If you suspect a sewage release may have contributed to the moisture that's allowing the mold to grow, a mixture of 1-part bleach and 8-parts water should be used to clean and disinfect the moldy area. Moldy, porous building materials such as carpet and drywall should be replaced.
Cleaning up mold in your home is generally a temporary fix. In order to keep mold from coming back, it's essential that you take measures to address the accumulation of moisture. Mold cannot grow without moisture. In some situations, reducing moisture levels may be as simple as running a fan in the bathroom after you take a shower or fixing a leaky pipe under the sink. In other situations, you may need to repair a damaged, leaky foundation or install a sump pump. If mold is an ongoing issue in your home, it's wise to hire a consultant to determine the cause of the mold, so you know what repairs you need to make to prevent it from returning.
While you're awaiting a more permanent fix, you can clean up mold periodically by spraying it with a commercial household cleaner, such as window or bathroom cleaner, and wiping it away with a damp cloth. If the mold is substantial, wear a face mask to prevent breathing in the spores, and wear rubber gloves to prevent skin-contact with the mold. Open the windows in the area you are cleaning to increase ventilation.