
You can take a large piece of cloth like an apron and wrap it around the seat so that the kids will not be able to put their dirt prints on the seat. Instead, he will be scuffing up the piece of cloth wrapped around it. However, you want to make sure you clean the cloth regularly.
You can also replace the cloth that you are cleaning with another cloth so that you don't have to worry about anything scuffing the seats. You just have to make sure that the piece of cloth that is thick and durable enough to withstand a lot of damage.