While it is tempting to mitigate this yourself, these situations show only the tip of the iceberg.
Beneath the pile of personal belongings are soiled clothing, food, needles, fleas, and caustic or flammable substances like stove fuel. In tandem, you have diseases like MRSA, Hepatitis A, B, C, E. coli, and HIV.
Any time bio hazardous materials exist (blood, vomit, chemicals, bodily fluids, and human excrement), property owners must follow strict OSHA for thorough training on how to deal with, clean, and properly dispose of such materials. Without this training, business owners are held liable for any damages incurred.