Old-Biscuit wrote:
Pick up one of this type of drain cleaners. Attach a garden hose to one end, shove it down the pipe, turn on water.....it will expand and seal pipe then power flush the line.
Have tank drain OPEN when you blast away.
Should be able to find at ACE, Lowes, Home Depot etc.
IF it doesn't blow the clog out then you will need to have a plumber attack it with a roto-rooter with a blade attachment

You think it will work on a curved pipe? I'll go get one tomorrow if you think it'll work.
No stores around here have one, I'd have to order one online somewhere.