I made my own hot tank cleaner by cutting a 55 gallon oil drum in half lengthwise, adding a set of angle iron legs, and building a fire under it. The cleaning solution was water, half a box of Tide, and 3 cans of lye. After several hours of boiling and a thorough rinse with a garden hose, that block was CLEAN! Just don't put anything aluminum in there- - - -you won't get it back!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!