Posted on the “classifieds” wall at the grocery store near our house. Interesting, huh? 
I don’t know why, but every ad includes the person’s race. 
When we were in Egypt, we were told by several people, “Oh, try and get a [insert race here] maid, because they are cleaner than [insert different race here]. Seriously. There’s a weird sort of accepted racism when it comes to maids. In Egypt there was a hierarchy that extended to pay as well. Egyptian maids were generally paid the most, then Pilipino, Indian/Sri Lankan, and finally Sudanese. I think that was the order. The general idea though was that certain races were known to be cheaper labor. It wasn’t just expat folklore, this info was printed in the Welcome to Egypt booklets that were readily available to expats. 
One difference here is that you won’t find Omani maids. All household help are what they call TCNs, or “third country nationals.” They live and work here, but aren’t native. I don’t know which race is considered “better” for maids here, but all these workers sure think listing their race is an asset to finding employment!