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how can i remove scale from my domestic heat exghanger?

i have a worcester 9.24 bf electronic combi,which needs de-scaling,what do i need to do,is it difficult to do,i can use hand tools,which isnt a problem.any suggestions?
ron, April 2010
look on the Fernox web site for their products

wirecutterman, April 2010
link Click here to see other fixes for Worcester.