I feel your pain Sharon! I am presuming you now have an oven with grill incorporated so you can’t use both at the same time. My daughter has the same problem and in a galley kitchen she just can’t get right inside to clean . Turn the grill on high for 10 mins to allow bits to burn off, then turn off and allow to cool. Then spray element with detergent and wipe with damp cloth. That’s should def show results, other than that, get the professionals in