Can you make good money cleaning people's houses?

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In the summer my mother is currently working at an elementary school cleaning the entire building. She is older, so this work is very tiring and draining for her. Ideally she would get a summer job doing something else, but what she makes cleaning the school she couldn't make as much anywhere else. Someone had suggested to her to put an ad in the paper for her to clean other people's houses. I was just wondering if there is anybody out there who does this for a living or for an extra income. If so and if you don't mind what the average pay would be...or for those who have there houses cleaned as well. Thank You.