Here's what I've done to clean/sterilize disease contaminated equipment. Take all the PH, thermometer, hoses, scrapers, etc. and throw them into a 5g bucket filled with water and 1/2 c bleach. Soak overnight. Dump the water, rinse everything well. Refill bucket with clean water and add a bunch of Prime (or other decholorinator). Mix well or plug in a PH and let in mix everything up. Let it sit in the decholorinated water overnight again. After this everything should be clean, chorine free, and ready to use again.