Contains sodium hypochlorite sodium hydroxide amines, c--alkyldimethyl, n-oxides. We used kil block on the bathroom waste the result was amazinggreat product great value ! This video shows you boiler tips from worcester: getting your boiler serviced, finding a professional boiler installer, reducing heating bills and replacing an old boiler with a high efficiency condensing boiler. Did you order your boiler care plan before th april ? Good product selection and likeable staff from.