Prepsol, if they have it. Will remove grease, oil, wax, and any silicone based lubes (the hardest to remove). Naptha is another good choice and you can pour a pint of it in your gas tank to clean the injectors (main ingredient in many fuel injector cleaners). Acetone, MEK, or Alcohol (as mentioned by Sheldon Brown) also works. Just be careful with many of these solvents..the fumes and volatility (flammable).

Personally, I'm not a fan of citrus or alkaline cleaners, water based or not, since many of them are either acidic or high-alkaline. Simple Green has a warning about using their product on aluminium and recommends min exposure, no longer than 10 min exposure time, and "extremely thorough" rinsing of any SG residue. Here's an old VeloNews article...just read the reply by SG marketing rep...recommends using their "Extreme Simple Green Aircraft & Precision Cleaner" formula over their other SG products for bicycle chain cleaning (don't forget to read the label instructions and recommendations): http://www.velonews.com/tech/report/...es/9216.0.html
Anybody ever see Extreme Simple Green Aircraft & Precision Cleaner stocked at a local store or hardware store?