Don't use bleach!
The reason bleach is advised against is because while it may kill/clean part of the contaminators, it allows the surviving spores to reinfect the now cleaned up area with no problem. It's like offering a big petri dish to the molds. The get a fresh foot hold & by the time you discover the new molds, it's too late.
Remember:
you cannot see the mold growing... only the final bloom!
Removal of contaminated materials is the only way to recover from mold infestations.
It is costly & has to be handed by professionals with hazmat type equipment.
If & only if you opt to try to remove the mold, you will need to contact the same kinds of people who remove smoke damage, blood damage and/or asbestos. They are trained in how to safely & completely remove toxic substances. Since mold can be life threatening(some varieties cause extreme illnesses), moving out is often the first thing advised.
In New Orleans, we had a group call "Clean Sweep" who handled these kinds of situations. Most cities have them as well. If you contact your local fire department & ask them for a reference, they should be able to assist you in locating a reputable company.
If you own the house, be advised.
Once your property has been noted for mold, it is very difficult to sell the house without that being noted into the future sales.
Check you local property sales laws, but typically it has to be mentioned.
Sorry to sound all scary about mold, but it is becoming almost epidemic & should be considered very dangerous. You might want to have a real professional(unaffiliated with any clean up companies!!) come take samples for lab test if you own the house in question.
All the best!