#2-Bacteria and Other Microorganisms Proliferation The germs and microbes contained in ancient urine stains can induce sinusitis, watery eyes, allergies, and airway irritation in otherwise healthy persons. These symptoms are not caused by toxic chemicals from bacteria but rather from the presence of bacteria themselves. #1-Risk of Infection Urine on carpet is very smelly and could lead to risk of infection for people with weak immune systems such as those who have cancer, HIV/AIDS, or other diseases that reduce resistance to infection. Carpet also provides a breeding ground for bacteria that may be passed on to others via contact with the skin or airborne when cleaning up urine stains. #0-Guaranteed No Cleaner leaves a smell that comes off immediately after washing, which means you cannot wait to wash it away. Also, no cleaner requires boiling, which is dangerous for pets and destroys most fabrics worth having.