Just discovered the pottery underground drains that should be taking rain water to the well are all blocked. The blockages have been caused by builders rubble ( following a roof job) soil and roots. From the well a drain rod can be forced to within four foot of the down pipe, however with a spiral fitting on the drain rod it only enters the drain a few inches. From the down pipe end the pipe is solid and I ve only managed to clear six inches. Please can anyone advise ? would the hiring of a pressure washer be of any help?