Here is what I use: For mild/moderate cleaning Simple Green works great. For heavy yellowing I use Purple Power which removes a lot of, but not all, of the yellowing (careful this can discolor metal). I use both with the Black and Decker Versa Pac rotary scrub brush with the soft brush attachment, if the case is removable, in the sink or driveway with a hose. Simple Green diluted 1:1 with water with a rag and Q-tips for cleaning the keyboard and parts of the computer near elecrical components that can't be hosed down or put in the sink as in step one. Goo-Be-Gone for spot cleaning of residue from stickers etcetera. Meguiar's Protectant as a last step.