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Fernox Cleaner | Central Heating Treatments | Screwfix.comOur range of boiler descaler, sludge remover and central heating cleaner from Fernox, Sentinel and No Nonsense helps keep your boiler working when you need it most - keeping you warm through the winter. | 1000's of products available in-store and online at low trade prices | FREE next day delivery available | FREE collection in 5 minutes | FREE Returns