Healthybon- my airway clearance routine is similar to many on this site. Twice a day with 7% saline, Aerobika and vest. I also use the autogenic drainage app. I received the vest a year after diagnosis. After starting airway clearance, I only had a tiny amount of clear or white sputum and sometimes it might have a BB size yellow wad. After about seven months I started having more sputum (about a tablespoon) and it’s grayish yellow so I don’t notice the plugs so much. My MAC was diagnosed by a bronchoscopy and after I started producing sputum my pulmonologist didn’t mention testing it. She pushed the antibiotic treatment from the get go, but I refused because I wasn’t having any symptoms. Now I see a different pulmonologist and he says test sputum every 3 months and do a yearly scan.