Got an old cast iron dutch oven with lid that's been sitting in basement for years. There's a bit of mold growing inside, and spider webs etc. Slight bit of n surface rust on underside (underneath on the outside, no rust inside). Can this thing be salvaged? I mean, its cast iron, I would think so, but??? I only recently learned these things must be "seasoned", so I have no idea really. Thanks for any tips.