My mother played it like this (and I dont know if it was "right" or "wrong" but here goes)...
She didn't pay us to clean our bedroom, as such, BUT, she would "inspect" our bedroom once a week, on a Sunday evening before our weekly Roast Dinner (!) and if the bedroom was up to standard, only then would she consider giving us our pocket money. So she didn't "market" it as paying us to clean our rooms, and honestly we didn't see it that way at the time, we knew we had to do it anyway, but it was very much a "you fullfill your obligations to me before I do mine to you" type thing. And it worked. It gave us a timescale to work to, and an incentive. And we'd start the week clean and organised, ready for a Monday morning, which is never a bad thing, and it would just gradually get worse as the week went on, then it was the weekend and we had the weekend to sort it before Sunday night again!
There were other things we were expected to do, and we had to do them regardless of pocket money etc.
When we got much older (like near school leaving age, 17, 18 etc) and wanted more money (for booze and fags really!) she was willing to step in and help out because she wasn't really in a position to be able to transport us to Saturday jobs etc and there wasn't the transport available (grew up in Oz, it was different there) and she felt guilty, so she gave us a "job" of cleaning half the house each (we divvied it up between ourselves) and she paid us the same if not more than what she would pay a cleaner if she had one.
This kept everyone happy because the house was cleaned properly (and we had to do it, she was a taskmaster and would inspect) which taught us how to clean properly, but in fact I believe it taught us the "joy" of cleaning - the satisfaction that goes with it, and it really drove home how much "nicer" things are when they are clean. It gave us ownership of it and I believe it did us more good than harm, even if there are people out there who think she was wrong for either making skivvies of us or paying us for things they think we should have been doing anyway. In reality, what it did was kill the problem of us needing a Saturday job, allowed her to justify just giving us more money to make that problem go away, and sorted her cleaning problem but without making a nag of her, which it might have if she'd just declared it something we "should" be doing.
There are lots of ways of going about it all, I guess, and I am undecided which tack I will take with my children when they are a little older but I am definitely open minded to child labour!