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For more stubborn residue, switch to a wet cleaning approach, like using a mild detergent solution

Using this method, for the control test, I had my assistant stand outside of the smoking area, take a pull from the cigarette without inhaling, and blow the cloud of smoke inside the box
About half were ignored as they were clearly not relevant to the current review based on their title or they were duplicates
Thanks for a great article, and comparisons that I consider a rare privilege to read

J., Summitt, J

Smoke residue can settle into coils and ductwork, then get released again every time the system runs