A chlorinated alkaline detergent with colour changing additive specifically formulated to clean plastic beer dispensing lines, used in the licensing trade. Regular treatment will keep lines remaining clear and reduce the possibility of fogging of the beer occurring. Colour changing additive indicates the state of cleanliness in the beer line. Detectable Beerline Cleaner destroys yeast and bacteria which accumulate on plastic beer dispensing lines during normal usage. The product will not adhere to the plastic line so tainting and head retention problems are totally eliminated. The product contains chlorine stable organic sequestering agents which control the possibility of water scale formation and assist in soil penetration.