Just for curiosity, what do house cleaners charge now a days?
I ended my cleaning career 16 years ago when I got the college job, and I was charging $15 an hour, which was very reasonable, and I often had to turn down jobs.
Sometimes I would charge a flat rate for big once in a while jobs, say when someone wanted all their windows done, or their floors stripped and re-waxed. Then I would say, $40 or whatever. Once I had a fastidious Italian lady pay me $30 just to spend an hour sitting in her basement polishing her silver.