flavel milano 60 cooker?

If the glass cover is circular it will need to be unscrewed anticlockwise - a damp cloth may help you get a better grip - burnt fat may have gummed it up a bit.

If rectangular then a large screwdriver will prise it away from the clips that hold it.

There's always a possibility that it's circular but needs to be prised out but it would be unusual.

Good luck...

Peccavi
July 2009