Crusty, dried-out, poopy toilets.......

[Richard Dale-Mesaros]

So my current rehab project is a 2007 doublewide whereby the occupants had left and apparently were out of water for an undetermined amount of time, during which they continued to poop in the two toilets. It's been a few months now and the contents are completely dried out...... I'm leaning toward just taking said containers to the dump and buying new ones, but in the interests of saving a few bucks, what's my alternative, hack out the crusty sh*t and leave boiling water in there before attempting a flush? Any other suggestions as to how to loosen things up before my tentative first flush? Obviously one of my concerns is that the sewer line going to the septic system is also gooped up, so I may be facing a visit from my friendly septic company with a power-jet thingy....... thanks in advance for feedback/ideas you guys!  :)