I've used alcohol before to loosen and remove gunky grease. A cotton swab at the joints of the arms lightly moistened with alcohol should do nicely. Once clean, the 3 in 1 oil is fine, or as Sue suggested, if you can get it, sewing machine oil will do (I think they are the same thing, frankly.). Nothing in a spray can, again just moisten a cotton swab and dab the joints with the oily swab. Then type on ALL keys to make sure the oil is distributed and you should be good to go. More alcohol on a swab will clean the key faces, too, then type out all letters (UPPER and lower case) on a fresh sheet of paper (Blotter paper is best) to pull the ink out of the little crevices in the letters (top of the e, center of a, o, d, b, g, etc). If you have to, repeat the process until all is working smoothly.