When my daughter won't listen, I tell her I will take something away. The deal with this plan is that you have to actually follow thru on your threat - otherwise, they know they can run all over you.
Don't want to throw things away?? Get 2 boxes about the same size and put the kids' names on them. Tell them "This is your earn back box Tom" When they get crazed or don't listen, take a toy to the earn back box. Make sure you take something they will miss. When they listen, they earn back a toy of their choice.
For my older daughter, we use "Tickety". Go get a timer and have the kids race Tickety. I set the timer for 5 minutes and tell her I'd better see a lot of things in her room put away or else I will clean - and that means I throw away.
For little kids, you may want to have them race Tickety to pick up a specific number of things AND put them where they belong. Then it kinda seems like a game. But, I will warn you that not all kids like the Tickety treatment. My 6 year old HATES Tickety - I think because there is no way to argue or stop Tickety - not like you do with Mom.
Whatever you do, I wish you luck!