Remove the cover of your typewriter with a screwdriver. Different typewriter models require either a Phillips or standard screwdriver.
Remove the ink bobbins from the typewriter. Place them on a cloth since they will leak ink.
Press a small screwdriver into a towel and remove all the dust, grime and dirt on the typewriter key and around it.
Clean between keys and any other areas you couldn't reach with the screwdriver with a cotton swab.
Use the compressed air can to blow out any loose crud that's inside the typewriter.
Press the typewriter key and then spray graphite lubricant on it.
Add the ink bobbins and cover back on your typewriter. Your key will no longer be jammed.