Lint free cotton cloth and either an APC (diluted) or something like 303 Aerospace Protectant - spray onto the cloth rather than the dash. If you have a heavily textured surface and there's something that the cloth can't get at, gentle use of a medium/soft detailling brush usually does the trick.
As always, before you use any previously-untried cleaning product it's a good idea to try it on a small, out-of-the-way area first just to check that it won't leave marks of it's own