This was an oven I had bought as part of a second hand kitchen from eBay. The oven had clearly never been cleaned at all during its lifetime. After two or three hours of uninterrupted labour, apart from time to gulp down a cup of tea, this oven looked as good as new. Not a speck of dirt on shelves grill pan top, bottom and sides. Amazing and worth every penny. I can’t recall the name of the miracle worker but please convey my thanks.