These are a natural alternative way to cleaning your toilet. Use as frequently as you like. There are two ways to use these. Full clean: Add 1-2 toilet bombs directly into the toilet bowl, wait 10-15 minutes, and clean with a toilet brush. Maintenance: Add 1-2 toilet bombs directly into the toilet bowl and walk away. Either option is great and effective in keeping your toilet clean and smelling nice. Super bombs the same as our classic toilet bombs BUT we add pure menthol crystal to the tablets. Menthol has natural antibacterial and antimicrobial properties that make it desireable as a non toxic cleaning agent. In addition menthols incredible natural powers are antiviral as well. The menthol crystals can cause skin irritation. Immediately wash hands with warm soapy water after dropping the super bombs into the toilet bowl.