Please see attached photos.
As an RN, public health I can tell you if you have these specimens tested, you will find positive for mold. To the point; Stachybotrys. This is the most toxic of all mold strains. Disinfecting supplies such as hydrogen peroxide, baking soda, cleaning vinegar, or bleach to kill and remove the mold. Otherwise an expensive abatement by a specialized company. **DO NOT MIX these chemicals**. Use of an N95 respirator is a must while around the mold. ***Then there is the mold you can't see behind the tiles, in the wall. How extensive is it? While I was there I kept the bathroom door closed at all times. When using the room, door was open. I had laid a towels over the affected areas as I could to inhibit inhalation of the spores.