Sometimes you have to give a little to get a lot. Kids aren't naturally motivated to clean the house - or even their rooms. A little encouragement is necessary in most cases and incentives can e fun and exciting. Incentives don't always have to be monetary - a trip to the park/playground, a chance to ride their bike or stay outside longer, have a friend over for an overnight visit...
Compromise and incentives can be useful for both parent and child!