It's possible for mold to return after remediation, but only if you don't find the moisture source that creates the mold problem. It is imperative that the water source be fixed, whether it's a leaky window or a broken pipe. Once the problem is fixed, correcting the mold will prevent the mold from returning to that location. Even after professional mold remediation, mold can reappear under the right conditions.
Most people quickly pick up the Clorox bottle to clean up the mold, thinking it will kill everything, but that's not the case. The mold will feed on the Clorox. It will come back again and again and it can be a vicious cycle. Using Clorox will also damage the paint, especially if you are trying to remove it from the drywall sheet.
If there's a problem with the water, any mold you remove when you scrub will only come back. If you suspect a leak, clean the area and see how quickly the mold returns. If it appears quickly, you may need to hire someone to fix the problem. It's impossible to get rid of all the mold and mold spores inside; some mold spores are found floating in the air and in house dust.
Mold spores won't grow if there's no moisture. Indoor mold growth can and should be prevented or controlled by controlling indoor humidity. If you clean the mold, but don't fix the water problem, the mold problem will most likely return. If there is mold growth in your home walls, you should check your roof and gutters and fix the water problem as soon as possible. If you need your gutters cleaned out asap, you can get a service like Gutter Cleaning Pittsburgh PA.
Throw away any moldy objects that can't be cleaned, including cardboard boxes and mattresses, which must be discarded. Wash clothes, bedding, and other soft cloth items, such as plush toys, in a washing machine on a hot cycle. Items that have been moldy for several weeks, such as bed linen, may not be cleanable and may need to be disposed of. Wash all the clothes you used to clean separately from other clothes.
Other contaminated soft furniture that cannot be put in a washing machine will need to be professionally cleaned. If this is not possible, they may need to be discarded. Thoroughly clean all affected hard surfaces. If you've decided to remove mold, make sure there is good ventilation and wear protective clothing, such as a shower cap, rubber gloves, eye protection, coveralls, appropriate footwear, and a P1 or P2 face mask (available at your hardware store).
The best way to control mold growth is to control moisture, so it's important to identify moisture sources and eliminate or control them; otherwise, the mold problem is likely to reoccur.
