Disclaimer: A crawlspace or any surface, where Python is absent, could be subject to mold growth. Mold growth in an untreated area, may affect a previously treated area. Following a Python treatment, it is necessary that all treated areas have air circulation from outdoors and dispersed to the outdoors by ventilation. Concealed areas must have permanent adequate natural air vents in operation. Surfaces previously treated with bleach may need extra cleaning to fully mitigate surfaces. If mold spores could infest your personal air space, a HEPA respirator is necessary.