Modern Purair Fraser Valley

We paid $388 for cleaning our duct system which has 15 vents, as well as a dryer duct cleaning and a new filter for the furnace. Kevin was very helpful in explaining everything he was doing and seemed very experienced and knew what he was doing. My only complaint was that I wanted to have the vents scrubbed with some sort of scrubber-thingy but he said it wasn't necessary and I didn't really understand his explanation. I didn't feel like going on and on about it and I'm not an expert which is why I hired them in the first place. He had a huge vacuum attached to the main duct though, and blew compressed air into the vents as well, and it seemed like that would do something.