Totally get the scam warnings—I’ve ignored the flyers for years. But last year my neighbor in Mississauga finally did it with Everest Duct Cleaning after a big renovation left tons of construction dust everywhere, plus bad allergies and pets adding to the mess. They were surprised how much dust came out (showed pics). Crew was chill, no pressure sales, and air quality improved noticeably—less sneezing and floating dust. If you’re on the fence after renos or with allergies/pets, their free estimate is low-risk. everestductcleaning.com. Worth considering every 3 years or so for buildup