Love to make a mess but hate to clean up! How does everyone handle this at your DC? Do you have rules for different ages? Games? Songs? Do you allow free play to become a big mess then clean up or use a toy then put it away? What works and what doesn't?

I have a toddler that doesn't understand clean up yet, she's just under 2. So I take her and the toy to the toy bin and we put them away together. The other is 4 and hates clean up. I need ideas for making it fun!? I use a sticker system if he does a good job without complaining, or we play a song and try to finish before the songs over, same goes with a egg timer. Any help out there?