Room cleaning once a year, it is clean, but the room cleaning it will need cleaning once a week it is good for more than just because it will make the room clean, without dust accumulation does not occur.
Room cleaning once a year is considered clean, but clean room it needs to be cleaned once a week, it would be good because it will make the room clean and free of dust does not accumulate.
Clean the room once a year is considered a clean but the clean room is it necessary to clean up once a week, it will be more effective because it makes the room clean without dust is not due to the accumulation.