I have a problem with a blocked drain in an upstairs toilet. The toilet was put in a part of an attic conversion and the down pipe is blocked. A toilet on the floor below which shares the same pipe is working properly, so I assume the blockage is between the two. I can't reach it with rods from the ground and am considering hiring a pressure washer and one of those attachments that travel in the pipe and clear the blockage by a jet of water.
What I want to know is can I put the jet down the actual toilet and if so would it be able to cut through all the all the crap that might be there before it reaches the blockage. (There is about 20ft of pipe between the two toilets).
To further complicate matters, the house was empty for about six months so this blockage could be there a while, would this make things worse if the stuff in the pipe has "dried out"? I have tried drain unblockers that you pour down the toilet with out sucess.
Any help would be appreciated.