If it were me, i would not only clean it...but i would hit it with a wire wheel too. I would probably start with a pressure washer good. Let it dry and then go over it with a wire wheel and try to get all the loose crap and rust off. Start fresh, and then season it good. Looks like it could use it on the outside too...then hit it with hi-temp paint (outside only). Sucker will look new.
Thanks Guys. Cleanining it seems to be the concesnsus.
Would you use any chemicals of any sort on the inside or outside (e.g. simple green) or stay away from them altogether?
I have heard that you can clean the outside real good, build a fire and coat the outside in a cooking oil instead of painting. Has anyone else done this? Otherwise what should I do, just use a heat resistant paint?