The answer to 'when to clean dryer vent' is that you should clean your dryer vent at least once a year, or more frequently if you notice any issues. A clogged or blocked dryer vent can be a serious fire hazard, as well as reduce the efficiency of your dryer and increase your energy costs.
Regularly cleaning your dryer vent helps remove lint and debris that can build up over time, which can restrict airflow and lead to longer drying times, higher energy bills, and even a risk of fire. Experts recommend cleaning the vent at least once a year, or more often if you notice any of these issues.