Blow all the dust out of vents, cup holders, etc with compressed air. Wipe top to bottom with diluted
APC. Vacuum, spot clean, foam carpet cleaner, agitate, damp MF, vacuum. If seats are leather: steam, wipe down, and apply conditioner while still damp from steam and let sit till you finish. Apply dressing of choice: Meg's QID and Optimum's Protectant Plus both have a matte finish with UV protection. Clean windows. Final walk around inspection....
Is that what you wanted (order of processes) or did you want to know how to do each step?