So I am working on a house my step mother inherited from her parents today to put it on the market.. It had shabby carpet through out the entire house. I was actually masking off the carpet in hopes of just shampooing it. Anyway I opened a closet door, bam Hardwood. The entire house has hardwood floors, sad part is her parents never knew they were there and didnt get to enjoy them. I guess my question is where the tack strips were, there are some black marks from the nails, is there any way to remove the dark spots from this? The floors need to be sanded stained and refinished, I guess thats a weekend project for a few weeks. any advice on wood filler or a final finish? Thanks for the help!