For my small house (~1200 sq ft) the woman who cleans my house charges me $150, and she's usually here for around 2-2.5 hours. She hasn't increased her rate for me for over 10 years, so I imagine she'd charge more if I started out new.

So in other words, even 10 years ago she was charging roughly $75/hr, which is much more than the $20/hr that grandparent was citing.