My oven had never been professionally cleaned before I booked Oven Wizards to do the job. I was impressed with the final result. He worked hard for three hours to make it spick and span once again. In fact, he left it in the same unblemished state that it had been when new, all the enamelled surfaces shining bright, the elements totally free of gunge, the whole double oven and it's glass door-panels perfectly clear of cooking residue, and even the trays and grills sparkling clean. I cannot speak highly enough of his work, and I would recommend him to anyone whose oven needs to be restored to it's original condition.