TV is a great motivator for most kids unfortunately. I give the time to pick up warning and they know the tv will come on when they are done to MY satisfaction and they can watch till lunch is ready which if I have figured it right that day based on how much mess and what is involved with lunch should give them about 15 minutes of TV. I call them out one at a time for diaper changes during the cleanup phase. If they don't get it done quickly well then we go straight into lunch and a reminder the next day of why they missed out on TV usually causes a scramble. Pick up works so much better if they really want is coming next.

I have found that grouping like toys together and limiting where they can be use has helped a lot in the sense that when dressup stuff can only be played with in the dressup corner. At least the pathways stay clear. If I see a child leaving an area without cleaning up they get a reminder and then physically taken back if they don't go on their own - rule is you stay with your first mess till you clean it up.