You`ll have to take the rads off and blow them through outside with a mains water hose - I`d leave the pipes alone ( as a DIY`er) because you could blow a load of gunge into the domestic side of the water tank
Very labour intensive on a one pipe sysem if in fact it is a one pipe system.If so then powerflushing with a machine is not an option.Remove and flush rads manually and beware of spilling water on your nice pale carpets.
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