Sick-free griddles are meant to be used with relatively low temperatures, up to 360 degres F. or so. Also, you have to put a thin film of oil on them before cooking anything.
As far as cleaning goes, clean under running hot water with a soft, plastic scouring pan and a good grease-cutting dishsoap. Do not put in the dishwasher as the soap can damage the non-stick coating.
Seeeeya; Goodweed of the North