Tools like scissors and knives are often used during propagation and caring for Haworthias. It is important to sterilize the tools before and between uses to prevent pathogen infection. Isopropyl alcohol solution (often branded as rubbing alcohol) is not very effective at killing pathogens that infect plants. One method is to use high temperature, like dipping the tool in boiling water or placing it in the flame of a lighter. A more thorough method is soaking in ~0.01% benzalkonium chloride solution (often branded as disinfectant cleaner) for ~2 minutes.