Potentially harmful bacteria, as well as food sources for pests, can be found in which may be located in the kitchen, bathroom, or the front of the house. exhaust fans sinks walls and floorboards drain lines

Potential harmful bacteria and the sources of food for the pests can be found in the kitchen, sinks as well as drain lines. This is due to water is needed for bacterial growth. Hope this is the right answer and this can be of big help.