Handling “hard dried stuff” in the black tank ?

Brandon the Traveler wrote:

dougrainer wrote:
I would shut the tank valve boil as much water as possible and pour that hot water with the rid x. Try to get at least 20 gallons of hot water and let sit for a few days. Hopefully that will break up the poop and get it into suspension to then drain out and flush. Doug

Why not dump 20 gallons of boiling water and a $10 bill down the turlet? The hot water will kill off the bacteria in the rid X, which is @ $10 a box, and even when active without boiling it to death will do nothing in something with a small volume such as an RV HOLDING tank. May as well use the $10 bill and save the cost and time of running out to buy the rid-X.

Well I used warm water from the tap, about 20 gallons and a half box of Rid-X. I let it set for about three weeks. Drove to a campground for a weekend and dumped the Black tank, the water was a bit chunky and very dark, it was much better.
There was a layer of dried poo in our black tank when we bought it.