Clothes dryer vents should be cleaned at least once a year, and more often if there are signs of blockage.
Some signs of blockage are:
Lint blockages in dryer vents are a significant home fire risk.
you empty it then wash it then put it back in
Edit:
The clothes dryer vent is the duct that vents the hot air generated by the clothes dryer to the outside of the building. It can be difficult to clean properly by the homeowner, as lint builds up on the walls of the duct, and hardens on so that it can't just be blown out or vacuumed up - it has to be brushed out with duct cleaning equipment.
Many air duct cleaning providers also provide dryer vent cleaning. Dryer vent cleaning will extend the life of your dryer as well as help prevent dangerous dryer vent fires.
The lint trap should be cleaned after each load for the best efficiency. Clothes will dry more quickly and energy costs will be lower.
There are many factors which need to be considered when determining how often one should clean a dryer vent. Most households should clean their dryer vent with a brush at least twice a year. The dryer vent should also be cleaned when drying time becomes noticeably longer than it has been previously.
You should let the clothes dryer vent, a few hours a day because if you dont you can get it damaged and it will cost a fortune to buy a new one or cost you money to get it fixed if you dont sort it right.
A hamster cage should be cleaned weekly.
Static electricity caused by friction.
A horses stall should be cleaned every day.
it makes your clothes/laundry softer it's often used in lieu of a dryer sheet
It has to be cleaned every so often, mainly if you can see that it is dirty than you should clean it. And it really should be cleaned every 4-5 weeks.
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every day
It must be cleaned daily.
Draperies should generally be cleaned one or two times a year.