Ok so my tank has this red sludge that drips out. Its clogged the petcock pretty good, and Id like to find a way to clean it out before I go through the trouble of re-building my petcock. The tank was supposedly treated and I have a feeling it was either done wrong or I just need to flush it out. Any ideas on what it is or what I could do to lean it out? Ill try and take some pic if needed