DriverWild
is one Smokin' Farker
This isn't a winter project it's a 3 hour project at most. The technique below works for my Big Green Egg so I'm going to assume your kamado will be able to withstand the intense heat in the correct process of cleaning a ceramic. That being said I don't know what it's rated at so do this at your own risk...
Whatever you do, don't use a chemical inside to try to clean it up. The proper way to clean a ceramic is to burn it out. Put a hefty load of charcoal in, light it, get it super hot, open vents all the way with the lid closed. Everything inside will turn white as snow. Also, don't replace your gasket before doing this procedure, change it out after as it will probably burn up, the glue will surely melt. Do not insert your grill grid as it will warp from the high temp. The exterior will be sizzling hot so don't touch it, not even the handle, just let it burn. After it cools use a shop-vac to pull the dust out.
Whatever you do, don't use a chemical inside to try to clean it up. The proper way to clean a ceramic is to burn it out. Put a hefty load of charcoal in, light it, get it super hot, open vents all the way with the lid closed. Everything inside will turn white as snow. Also, don't replace your gasket before doing this procedure, change it out after as it will probably burn up, the glue will surely melt. Do not insert your grill grid as it will warp from the high temp. The exterior will be sizzling hot so don't touch it, not even the handle, just let it burn. After it cools use a shop-vac to pull the dust out.