Inside
1. Use paint brush to clean out dust and crums from dash and tricky corners
2. Vaccuum everything
3. Carpet cleaner.
4. Inside of windows
Outside
1. Wash with something harsh to strip down to bare paint.
2. Rainx
3. Clay bar
4. Fix minor chips and scratched from the last 4 months
5. Polish
6. Sealant. I like Chem guys Factory Sealant (green bottle) not the best shine but great seal, low static and long lasting. It's a great base if you like to layer. I'll be giving Chem guy LAVA a try too, I've heard bad things but I bought it anyway
7. Tire shine / 303 Aerospace on plastic bits.
8. Go get it dirty
I'm sure I'm forgetting something