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Our main waste line backed up; the plumber, clearing the clog put waste water on the floor of an already damp basement (there have been repeated dampening incidents over years). We did our best to dry it, but mold has quickly appeared in that area.

Worse: a contractor, brought in to assess, inspected the entire basement and found mold on all walls throughout, front to back, c. 1000 sq. ft., not just in the wet area. Scary. He advises a big abatement job: three chemicals, wire-brushing, cement, HEPA vaccumming, paint, and intallation of a mega dehumidifer venting to the outside. And advises: “Don’t use bleach” — contradicting advice already received.

Does anyone have a sense of whether this makes sense, is overkill, will or won’t work, etc.? Thanks for any thoughts.