We are looking to buy a log home that was started but not finished. The roof was not shingled and the inside corner logs where water has ran down is now black and white. It has only done this to mainly two spots in the house. The outside logs are just dull looking so hoping that blasting will do the trick on that and of course a new roof. Can you use bleach on the mold or should you just blast it? Or will these need replaced? This house is in NW Indiana and not sure of any log home specialists b