Swore brushing was enough for 9 years until a sweep in Baltimore showed me a flue we both cleaned, his side had zero soot left | Chimney Sweeps - The Design Community Hub
Isn't it weird how we assume we're doing something right just because nobody ever told us otherwise? Same thing happens with hand washing, people scrub for like 5 seconds and think they're clean but the soap never even touches half their fingers. Or how everyone thinks they're a good driver until they ride with someone who actually follows the rules. Having a second person who does the same task shows you the gap real fast.