baked on
- crustyHard-shelled, literally or figuratively
- residueMatter left behind
- stuckUnable to move
- greaseThick oily lubricant
- grimeIngrained surface dirt
scorched · burnt · encrusted · stubborn · scrubbing · soak · charred · oven · casserole · pan · carbonized · elbow grease · scouring · caked · hardened · crispy · blackened · layer