Keeping a house clean is a big job. Having everyone help with extra Saturday chores helps me stay on top of things and teaches them to work. I have typed up list of what I expect everyone to do on Saturday morning. I keep it in my binder and pull it out on Saturday morning and put it on the fridge. It is in a plastic sheet protector so that they can use a dry erase marker to check off chores that they have completed. After everyone is done I take the chart down and put it away until the next week.
If we know that Saturday is going to be a busy day I sometimes offer an incentive (extra screen time or fun activity) if they get their chores done on Friday.