Restoring Discolored Green Logs Before Staining

I am building a new log home by myself. I started it last summer. I bought green wood, fresh cut logs that were milled for tongue and groove. I also bought green wood for the posts and beams etc etc. The wood I used last summer has started turning black (mildew and mold). I should have it under roof by early spring. How should I approach getting the wood back to orignial color before borate and staining? The logs are oak and the rest of the wood is pine.