Rescue ready to use is a one-step cleaner disinfectant that prevents outbreaks and kills a broad-spectrum of pathogens within 1 minute (including canine Parvovirus). ready to use (RTU) is osha-compliant, requiring no dilution, is a non-irritant, and has the lowest possible EPA toxicity rating. Recommended by door Marty Becker, rescue is the only disinfectant of fear free.