decide after you remove the carb.
Its a single plane - yes? Should be able to vacuum it out but depends what's in there.
Carb - see what's in there and condition of the metal. Insects can crawl into the bowl vents but generally the worst is going to be dried fuel residue (varnish) and failed seals and gaskets. Ultrasonic cleaners are the best way to clean them, but need a decent size one. So just take your time. Let it soak the best you can. Spray cleaner through everything and blow it out with air.
