It is the HOT water that dissolves the minute salt particles. The hotter the better use caution as to not get scald by the boiling water. Just think of trying to dissolve salt or sugar even soap, in cold or luke warm water then try it with boiling hot water, plus the heat in the steel helps dry the parts. I forgot to clean my tok once,,, that wont happen again, got a dark bore now, still shoots better than I can but lesson learned, allow time after your shoot to clean it properly and oil with something. Also as said above, you get to know your firearm well and get to inspect it for breakage, they are machines after all and machines break!