A clean production agreement is like an agreement between two people who want to work together to make sure they don't make a mess. When you're playing with your toys, you don't want to make a big mess that will be hard to clean up, right? Well, when grown-ups make things like cars or clothes or phone, they also don't want to make a big mess that will be hard to clean up.
So, they make a clean production agreement to work together to make things in a way that doesn't hurt the environment or make a big mess. They might agree to use certain materials that are better for the environment, or to use machines that don't make a lot of pollution.
This way, they can still make the things that people need and want, but they're doing it in a way that's good for the Earth and everyone who lives here. It's like working together to be responsible and take care of the planet.