My Hotpoint First Edition WM52 is washing through the cycle in a seemingly normal manner and is using hot water as the boiler kicks in on the cycle. The problem is clothes don't smell clean when it's been washed. I used my mums washer and the same detergent as usual and clothes that had not been fresh for months are now fine!! I live in a hard water area and she lives in a soft water area?? Could that be the problem or is it the filter? In which case - where is the filter??