Hey, i was always slaving over mine to try and get it clean, when a mates mum came over, and said when it is clean, (ie custed bits scraked off - i use a razor blade....) use some kitchen roll, and white vinigar water. get a spray bottle, fill up to 2 inches with white vinigar, and the rest water, spray on surface, (works to get shiny work tops shiny again too) and buff off with a couple of peices of kitchen roll. MUCH EASIER THAN BUFFING WITH A TOWEL!!
They are a pain in the a** to keep clean though!