Air Duct Cleaning - Anti-bacterial spray question
1. One of the tele-marketing companies (checked online reviews and seems decent) offered me a quote for 100 bucks which includes air duct cleaning and spraying of anti-bacterial/disinfectant in the main vent. On inquiry, they said the ant bacterial/disinfectant is a combination of water, glycerine and some chemical I cant pronounce. I am not sure if this is safe i.e. spraying anti-bacterial/disinfectant in the main vent for 2 reasons i.e. a> not sure if it is safe from a health perspective and b> what if the duct cleaning is not done properly and wouldnt spraying liquid on it would make any dust balls or particles stick to the walls of the vent
2. I called a company that my neighbor used last year and he said its apparently illegal in ontario to spray any chemicals in the vent system which is why they dont do it. He offered a package for $180 which includes air duct cleaning as well as camera inspection before/after.
I am not sure who is right about the anti-bacterial spray and if so, is it safe?