J.S.
Sprinkle it with baking soda and spray white vinegar over it. Let it sit like that for a little while and they scrub the food grime off. Works like a charm for me! If the smell of vinegar bothers you (it bothers me!) you can add some essential oil. I use sweet orange and can hardly smell the vinegar at all. I use the same concoction in my shower and it works fabulous. Best of all, it's non- toxic and cheap!! Hope the helps, happy cleaning :)