teams of cleaners , known as ` lonely death squads ' , clear houses where elderly people lay dead for months .
police remove decomposing corpses but the clean-up crews are faced with houses filled with rubbish and flies .
in rapidly ageing japan , more and more people are dying alone and unnoticed in a country of 127 million people .
one in four people in japan is over 65 - with increasingly loose family bonds adding to the isolation of the elderly .