The Adey MC3+ Central Heating Cleaner is a 500ml liquid designed specifically for boilers in central heating systems. With its new formula, this radiator liquid effectively removes limescale build-up and other debris to ensure optimal efficiency and performance of your heating system. Trusted by homeowners, this product is a must-have for maintaining the cleanliness and functionality of your central heating system. Requires draining and refilling the heating system after putting in the pipework