While I love using my chefscape griddle, I can' t get it clean, The grease sticks to it and turns orange, I've used the green side of a scotch kitchen sponge but I still can't get it removed. I've had to use a whole can of goof off after my 1st time using it. I am not using anything but oil to coat it, not PAM or anyother product from a can. Can you halp me please?