I was wondering what you think is the best way to clean the plastic dash and door parts? Thanks for your help in advance.

 

i use armor-all and it works good for me

 

For cleaning, any APC diluted about 10:1 will work just fine. Carpet needs Woolite/warm water at 5:1. For protecting, you can use Meguiars Quick Interior Detailer or Duragloss Vinyl and Leather dressing. Both are not greasy and water based, so you dont have that nasty greasy feel.