Hi Terry
I have access to a product called Oven Mate.
You paint it on with the brush provided. It removes the most hardened baked on grease, oil and fat with no acrid smell and can be used for ovens, barbies and even pans.
It comes in at £7.99, i am in the south east If i can't deliver it personally it will cost about £3.00 to post it (it's 500ml) It is a corrosive (has to be i guess)
Interested contact me on mandms@riomoon.fsnet.co.uk
Regards
martin