If your kids are anything like mine, they will definitely love this activity. So my kids love to make mess. They think it's the funnest thing in the world. So every once in a while we'll do a family car wash day where we'll take the kids outside and we'll get soap and water and the kids will help us clean the car off and they have so much fun doing it. Obviously, we can only do this in the summertime because the winter it's way too cold to do that. But it's always an adventure doing it because the kids are making a mess but it's a clean mess and we use all clean bacteria. We use all clean products so the kids aren't getting harmed with it and I've never had any issues with them putting it in their mouth. But definitely be cautious if you have younger kids because my kids are two and three so they've kind of learned not to put stuff in their mouth. But highly recommend doing a family car wash day with your kids.