One of the reviews talks about soaping the pot to keep it from turning black. That's what the link refers to.

Wasatch, what soaping does is make it la bit easier to wash the black soot off the pot. It doesn't keep the pot from turning black, and the pot will eventually end up black (at least in spots) anyway. It also requires a thick coating of soap each time. Consider that a black pot will absorb heat more efficiently! The black will rub off, so you'll need to put the pot in a stuff sack to keep everything in the pack from getting black. After trying both ways, I decided that soaping the pot wasn't worth the trouble. Soap is hard on aquatic life, and IMHO the less you use the better.

This is one reason I prefer to cook over a stove rather than using a fire. It's easier on the environment, too. Out here in the West there are quite a few places you can't build a fire, either because the surroundings are too sensitive (high altitude or overuse) or because of high fire danger. The bonus is a non=sooty pot!