If your clog is organic, a weak lye sollution may dissolve the blockage Once the clog is unblocked then neutralize the lye with vinegar, and flush with water. (lye isnt too bad, its used to make pretzels hard, but it is not the best thing to have unneutralized, it is a strong base, and dissolves most organic things.. vinegar turns it into salt.... which then flushes out with the water