Hey their chintzgirl,
The interior dash components are are painted with baiscally the same automotive type of paint that is on the exterior of your car, but just painted over plastic. The cleaning process is much the same as outside. A good coat of Glaze, and Wax, and your good to go. I always try to recommend the use of Glaze as it gives back much needed nourishment to the paint which makes it stand out better, but just a good coat of Wax is fine. Its best to apply a quick coat to the interior plastic about every three months or so as you can usually go longer on the interior components since they are not exposed as much to the elements, or direct sunlight. Then a good once over with a Quick Detailer Spray is good for general cleaning for the rest of the time.
As for the Leather Seats thing that came up here, you guys are killing me with the Murphy's Oil.
Its better than the Armor all which is an oil based dressing which will big time suffocate the Leather causing it to crack in no time, and also will give it a really oily, greasy feel to it which will transfer nicely to your cloths, and cause a pretty nasty mess. Murphy's Oil is better, but still not good real good on Leather as it will lead back to the same result. by drying out the leather, just at a slower rate. In addition, the oil will absorbe into the top layer of the Leather which can cause damage to some types of leather which is very hard, if not impossible to correct. This also can lead to the leather becoming dry, brittle, and in some cases cause brighter dyed leather to smear, or lose its color.
Here is my write up I did on Leather Seats, along with my recommendation on what to use, and how to clean, and properly condition the leather without causing any damage. If you scroll down to the bottom I have more info related to the write up on top. Here is the Link.
Detailing Your Interior: Leather Seats
You all go easy, and as always, if you have any questions, I am always here, and more than happy to try to help out wherever I can.
Candyman