If pan on fire (not like a George F)
boil some water with 3 tbs of baking powder all the gunk will slide off with a sponge with out scratching your pan.
If a George Forman style grill or oven tray spray with “SANO – Javel Cold Grease Remover”
Place in garbage bag and close tightly. Leave overnight
Next morning lightly rinse with sponge.
All these tips are for saving your pans from getting scratched and ruined