Wondered if any of you had had this done and whether it was worth it? Have never had a clean oven since moving in 8 years ago and despite having tried shop products it still smokes etc from having fat on the elements etc. Nor can I get black stuff off from the shelving. Would professional oven clean deal with those areas? Frankly it's disgusting and smoking and with 3 kids I don't feel like devoting significant time to fighting with it.