I’m having difficulty finding that link. But basically, the procedure is : use a nebulizer to inhale a vial of albuterol, then one of 7% saline. While doing so, every five minutes, do some “huff” breathing and then cough up whatever you can into the sterile container. Do this a couple of times, until you have 3-5 ml of product that shows some strands or evidence of something other than saliva.