Share 'Metal Mold Refinishing'

I was looking through my molds and found some of them have what appears to be blemishes on the inside. It may also be the start of rust. These molds were my father's and I am not certain of the storage. I would like to explore having them refinished, but have no idea where or the cost. I am not a choclotier by any means, but some of the molds are rare and I enjoy making them at Easter for friends…