I've been very unlucky with the maids and yaya's that I've hired in the past. Some doesn't want to follow MY rules in the house. I don't even ask them to wear an all-white uniform or any other kind of uniform other maids use.
Every single maid that I've hired doesn't know anything about housekeeping at all! They wait for me to tell, most of the time I have to teach, them what to do. They give me nothing but headaches so I decided not to hire a maid anymore.
How I wish there's a school for maids. Most agencies give a few days of house keeping seminar to would-be maids. But I don't think a few days is enough. A month or two of daily training should make them the best maid in the country.