For general smudges and fingerprints, we recommend saline solution and a clean microfibre cloth. If you have deeper scratches or dings, you can use polyurethane-friendly buffing compound or polish like you’d use for a boat or car. You should double-check the compound you use is nonreactive with polyurethane finishes. The above approaches work for both our carbon fiber and wood…

It sounds like your nut has fallen out. It is the piece of bone between the string retainer and the fretboard that positions the strings above the fretboard.  Check in your bag – or in the slot area where the neck sits in the bag.  If not here, check around the last place you opened your guitar case and noticed…