I have some pretty old enameled cast iron and I love it, but I hate it when it gets faded and old looking. This is how I keep my enameled cast iron shiny and bright, without buying any special cleaners.
Don't use Le Creuset dutch oven with chipped enamel on the inside! Here's what to do and how to utilize the lifetime warranty. And read our full article here: https://helpatmyhome.com/chipped-lecreuset-what-should-i-do/