I work for a cleaning contractor and we pay our central London cleaners minimum wage £5.52 per hour, but you can't get away with that for domestic cleaners...you need to pay more to get someone who is self motivated and honest. Our cleaners are overseen by management...if we left them to their own devices they'd do sod all and rob all the computers.
I know someone who sacked their cleaner cos he found out she was playing with his drawer full of sex toys and watching his porn.
I'd rather do the cleaning myself than have a stranger nosing through my stuff.