the fretboard looks hecka dirty, but that makes it relic-ish imo.
as for the frets, polish with the stuff people have recommended earlier in the thread (waves fret cleaner, autosol, dunlop65, your choice.) ONLY when you change your strings, but it does seem your strings need changing.
do wipe down the strings or use string cleaners after playing. keeps strings sounding good and the feel much more playable.
as for me, change strings everytime they feel dead. say under a month with irregular playing.