As discussed, it is a combination of factors:
1. High humidity in the room even when a/c is switched on, it is uncomfortably humid in the room which can be seen from the moist on wallpaper, walls, doors, floors and mirrors. The high humidity is causing the wallpaper to loosen, mold to grow etc.
2. Cleanliness poor cleanliness in the rooms on 4A. This has been highlighted to assistant executive housekeepers and supervisors. As discussed with Khun Antika (asst. exec. hk) there will be strict training and follow up in this area and significant improvement should be made. To check the progress again upon my return early May.
A combination of the above provides the perfect circumstances for mold to grow