What it means: washing used cloth diapers in a special combination of chemicals to get rid of set in stains, mineral deposits, and all sorts of other gunk (iloveclothdiapers.com)
It also has a flip - top lid for the measuring cup, which is nice since it keeps dust and crud out of it so you're not adding other gunk to the warming chamber. (thespruce.com)
These include trans fat and other gunk accumulated inside over the years. (alivebynature.com)