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 dirty dryer vent can be a fire hazard and can also reduce the efficiency of your dryer, leading to longer drying times and higher energy bills.
It's recommended to clean the vent when you notice any of the following signs: longer drying times, excess lint buildup, or your dryer running hotter than normal. Additionally, if you have a gas dryer, it's important to clean the vent regularly to prevent the buildup of potentially dangerous carbon monoxide.