One means of clearing a way through a blocked pipe, with bends, is to try to push a length of curtain rod through it.
If the blockage is really solid,, by rotating the curtain rod, you can sometimes "driil" through Once there is a hole through, repeated "jiggling" will sometimes clear away much of the remaining clag. At least oil, or some other solvent will help to soften, maybe even dislodge, the rubbish. Once the pipe is clear, the debris needs to be removed from the machine, so that it cannot recirculate, and cause problems in the future.
Howard