Hi, Tingmum,
How are you? Haven't talked to you for a long time.
My sister said that the Rainbow 用水除塵機 works very well. Some of my relatives had bought it.
She can help to coordinate to offer a free demo to clean your house. So you could have a try.
You can call me if you're interested. (I still have your mobile#, just in case you lost my mobile, I pm you my mobile again.)