DIY & Home Improvement

I've used caustic gels (which stay put even on vertical surfaces) with good results on enamel before now, even on a heavily caked second-owner oven - not very environmentally friendly, and you'd need to ventilate and wear gloves, but you shouldn't have to use much. I just left it on for the specified time, then scrubbed off with water and a soft plastic scrubbie, then repeated the process if it didn't take everything off, using a metal scrubbie very gently and carefully on small problem areas.

If you go for this, you should obviously test it on an inconspicuous small area of enamel first, in case it mars the finish.

If the heat's been too great or the enamel's been scratched by previous cleaning, the enamel may be unrescuable anyway, but as long as it's clean and out of sight during normal use, it may not matter too much.