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Powerflushing a Worcester 400 boiler?

I have been asked to powerflush a high flow 400 bf boiler. I know it's full of sludge but not sure if there's a particular technique to remove the sludge just for this model. Are there certain areas that the sludge collects and how do you clean out the return filter?
Flush eng, January 2014
link Click here to see other fixes for Worcester 400 BF.