Hi Bill
Maybe you should think about offering a deodorising or sanitizing service. Also i imagine urine smells would be an issue - how about Urine neutralization?
Prochem products are good, i use Odour Fresh,
Urine Neutralizer, also i understand a good sanitizer is Microsan effective against bacteria (including MRSA), viruses (including Hepatitis B and HIV), fungi, algae and mildew.