I've been reading a lot about cleaning and sanitizing procedures and products. I have been reading a lot of pro brewers clean with an alkaline cleaner like PBW, rinse, use an acid wash like acid cleaner #5 (or BS Remover for home brewer), rinse and then use Saniclean. What is the purpose of using saniclean if the kettle is not going to be used right away? Even if it is used right away, why sanitize something that is going to have boiling wort in it?