I have a clogged drain in a 50YO house that the plumber could not snake out. He suspects that the clog is in a section of pipe that he is guessing goes vertically from the one bathroom sink to the other bathroom sink and said that the plumbing will have to be disassembled behind the wall to locate the clog and clear it. The drain just trickles and takes forever to clear the sink.
Does anybody know of any alternate ways to clear a drain besides (a) snaking, (b) plunging, (c) pouring boiling water down the drain, (c) using Drano, and (d) using slow-drain clearer, none of which are working? Do the pressure things work -- the ones that send either water or down down and gradually create enough pressure to dislodge the clog?
TIA for any help I could get here.