How can you protect the electrical switches on an x-ray unit while keeping the switches free from contamination and electrical short circuits? The label on a new disinfectant states in large print that the product "will kill HIV in 30 seconds," and in smaller print, it states that the tuberculocidal time is "10 minutes." How long should you leave this product on the surface to be disinfected? What precautions must you take when using immersion-type disinfectants? As you are removing plastic barriers from the light handle, you notice that one of the barriers had a tear in it. No blood is visible on the handle. What would you do, and why? You begin a new job in Dr. Landry's office and discover that the dental assistant is using a 1:100 solution of household bleach for surface disinfection. What would you suggest to the assistant, and why?