I work in a 'business casual' office in IT where the microwave is not cleaned by the cleaning staff and the adults do not clean up after themselves. I cleaned the microwave thoroughly after finding a hair in it and it being caked with food.
We have plastic splatter covers that go unused and when those get soiled they are left dirty. A fellow co-worker sent an email out last time I cleaned the microwave asking that people keep it up, but that has not happened.
Should I put a sign up over the microwave asking people to clean up after themselves? What would be the appropriate action? This is not answered in "How can we keep a shared common area (kitchen) clean? " Show me where this has been specifically addressed and resolved elsewhere and I will delete.