Technical Help Frequently Asked Questions I'm looking to replace my hydrochloric acid bowl cleaner with something a little safer. What do you recommend that is safer, yet works as well as hydrochloric acid? Is it necessary to clean toilet bowls with an EPA-registered bowl cleaner? What are the most critical areas of a restroom to disinfect? My disinfectant states that it requires 10 minutes of contact time before it is wiped off. In order to do this, how do you recommend this product be applied? What is scale?