Bleach is strong and is harmful if not careful, its made of chlorine gas in a concentrated solution of sodium hydroxide, which forms sodium hypochlorite and sodium chloride. ***Milton Sterilising is a form of bleach and contains sodium hypochlorite 2%. It is recommended over other bleach formulations as it does not contain colouring agents or perfumes, so it is less likely to cause stinging or irritation. on their website they say it is is totally food safe and can be used to disinfect fridges, chopping boards, plastic containers with no need to rinse.