I have just moved into an old house where the heating system seems to be around 50 years old (but a new boiler). Most of the radiators are hot at the sides and top but not in the middle. I am in the process of flushing them with Fernox to clean them but I suspect i will eventually have to take off the faulty ones and power flush them through. I have no specific tools for this however. Does anyone have any tips on an easy way to do this power flushing? Tks for any help!