I confess I like when my stove is clean. I feel an aesthetic joy in having it all shiny and beautiful. It's the kitchen's equivalent of having a diploma hung on the wall. But that also means the stove loses some of its usefulness, as now I worry I'll dirty it while cooking. So now I pragmatically leave it dirty, so long as its efficacy is not compromised. There's a beauty in that too, as the goo tells something about the its past trials and achievements.