Smell your incubator vents at least every few days. Anytime you smell something bad, open the bator and find it. Don't stop till you find it and get it out. Exploding eggs are VERY bad!
Now that you have a mess, you gotta get it all out or you will have more trouble. Try hydrogen peroxide in an spray bottle. Hydrogen peroxide will break down into water and oxygen, neither will harm your eggs in the long run. Remove everything and spray it all down. Repeat as needed till it's clean. Again, once peroxide is dry, it's fine to put eggs/chicks back in. Good luck!
-Matt
(Chemist, Engineer).