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No, this is because there is a beam on it that you need to make a suspended ceiling to prevent the formation of a situation where the beam is pressed on the top.
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There is no such thing as dirt. There are too many "mouth" word ceilings, I have done less to say that there are hundreds of such ones, no problem, you can rest assured.
The fact is that there is, but if the ceiling is flat, then it has been dissolved, this lower beam!
Not counted. However, it is not recommended that the air conditioner is directly facing the human body, so it is necessary to pay attention to the prevention of air conditioning disease and keep the indoor air moist and the temperature appropriate. Clean the filter of the air conditioner regularly to reduce the harm of the air conditioner to the human body.
Drop a drop of sesame oil into it, and it comes out, it's fine.
Not good, try not to have beams indoors, if there is, it is best to wrap it into the ceiling when designing the ceiling.
Car decoration stores have leather cleaners, and wiping with this will be clean.